A kind of method for preparing polypropylene hollow fiber porous membrane

A technology for polypropylene and porous membranes, which is applied in the preparation of porous polypropylene hollow fiber membranes with a sponge-like structure, and in the field of preparing polypropylene hollow fiber porous membranes. Membrane, non-environmental protection and other issues, to achieve the effect of reducing production costs, shortening the production cycle, and promoting recycling

Active Publication Date: 2016-08-10
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patent documents ZL01144479.7 and ZL201010191837.0 use diphenyl ether as diluent to prepare PP porous membrane, which has pungent odor and is not environmentally friendly
Chinese patent documents ZL201110103439.3 and ZL201110282959.5 use phthalates or vegetable oils to prepare PP porous membranes. Vegetable oils are not easy to dissolve in the common extractant ethanol, and toxic n-hexane is used as the extractant, which is not environmentally friendly and unsuitable. industrial application
The use of the above diluents cannot produce a sponge-like structure PP porous membrane with good permeability when the polymer concentration is high, which limits the improvement of the strength of the PP porous membrane
At the same time, the PP film preparation process adopted by the above patented technology is a batch process, and the film production cycle is long, which is not suitable for industrial applications.

Method used

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  • A kind of method for preparing polypropylene hollow fiber porous membrane
  • A kind of method for preparing polypropylene hollow fiber porous membrane
  • A kind of method for preparing polypropylene hollow fiber porous membrane

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preparation example Construction

[0022] The technical scheme of preparing polypropylene hollow fiber porous membrane of the present invention is as follows:

[0023] 1) Continuously add 20% to 40% polypropylene by mass to the first heating section of the co-rotating twin-screw extruder through the hopper, and continuously add 80% to 60% by mass diluent to the co-rotating twin-screw extruder from the side In the remaining one or more heating sections of the twin-screw extruder, the co-rotating twin-screw extruder adopts at least 4 heating sections along the screw extrusion direction; the diluent is triethyl phosphate, tributyl phosphate , trioctyl phosphate, lauryl alcohol, cetyl alcohol, stearyl alcohol, diethylene glycol, octadecanoic acid, diphenylmethane, eicosane, myristic acid, oleic acid, benzophenone, water Methyl Cylate, Ethyl Salicylate, Methyl Benzoate, Ethyl Benzoate, Butyl Benzoate, Diethyl Sebacate, Dibutyl Sebacate, Dioctyl Sebacate, Tricitrate One or a combination of ethyl ester and benzyl ben...

Embodiment 1

[0034] Polypropylene (weight-average molecular weight is 1000,000, isotacticity is 96%) and tributyl phosphate, the composition of which is 20% by mass of polypropylene and 80% by mass of tributyl phosphate, is added to the same direction Dissolving and defoaming in a twin-screw extruder (screw diameter 20 mm, screw length-to-diameter ratio L / D=60) to obtain a homogeneous casting solution. The polymer homogeneous casting solution is injected into the outer gel medium through the hollow fiber spinneret through the melt pump and the inner gel medium at the same time to solidify to obtain as-spun filaments. Ethanol is used to remove the diluent in the as-spun silk to obtain a polypropylene hollow fiber porous membrane. The detailed preparation parameters and properties of the obtained polypropylene hollow fiber porous membrane are shown in Table 1.

Embodiment 2

[0036]Polypropylene (weight-average molecular weight is 3000,000, isotacticity is 97%) and triethyl phosphate and trioctyl phosphate, the composition of which is 20% by mass of polypropylene and 40% by mass of triethyl phosphate %, the mass percentage of trioctyl phosphate is 40%, and it is added into a co-rotating twin-screw extruder (screw diameter 20mm, L / D=60) for dissolving and defoaming to obtain a homogeneous casting solution. The polymer homogeneous casting solution is injected into the outer gel medium through the hollow fiber spinneret through the melt pump and the inner gel medium at the same time to solidify to obtain as-spun filaments. Use n-hexane to remove the diluent in the as-spun silk to obtain a polypropylene hollow fiber porous membrane. The detailed preparation parameters and properties of the obtained polypropylene hollow fiber porous membrane are shown in Table 1.

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Abstract

A method for preparing a polypropylene hollow fiber porous membrane relates to a method for preparing a polypropylene hollow fiber porous membrane by using a heat-induced phase separation method. The present invention adopts tributyl phosphate and other diluents to prepare porous polypropylene membranes with a spongy structure at high polymer concentrations; at the same time, adopts a co-rotating twin-screw extruder and a specific feeding process to continuously and stably prepare polypropylene hollow fibers membrane. The method effectively improves the strength of the polypropylene porous membrane, shortens the membrane-making period and reduces the membrane-making cost.

Description

technical field [0001] The invention relates to a method for preparing a polypropylene hollow fiber porous membrane, in particular to a method for preparing a sponge-like structure polypropylene hollow fiber porous membrane by a thermally induced phase separation method, and belongs to the technical field of polymer material preparation. Background technique [0002] With the rapid development of economy and society and the continuous improvement of people's living standards, more and more pollutants are discharged from production and life, which leads to the deteriorating quality of water sources in my country. There are more and more pollutants in water, especially organic pollutants. Water quality standards have been greatly improved. The existing water supply industry is facing unprecedented challenges, and the conventional drinking water treatment process has been overwhelmed. Membrane water treatment is considered to be a new generation of drinking water treatment tech...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/26B01D67/00B01D69/08
Inventor 王晓琳周波刘在浩林亚凯庞博
Owner TSINGHUA UNIV
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