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Improved preparation method of polypropylene hollow fiber separation membrane

A technology of fiber separation and polypropylene, applied in the direction of semi-permeable membrane separation, chemical instruments and methods, membrane technology, etc., can solve the problems of uneven distribution of membrane pores, dense cortex on the outer surface of the membrane, etc., and achieve the effect of simple method

Active Publication Date: 2013-04-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The technical problem solved by the present invention: the present invention provides a kind of preparation method of the improved polypropylene hollow fiber separation membrane, by selecting two-stage or multi-stage coagulation bath, and the composition, temperature and residence time of each coagulation bath Carry out control to solve the problems of dense outer surface of the membrane and uneven distribution of membrane pores when TIPS is used to prepare polypropylene hollow fiber separation membranes in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A kind of preparation method of improved polypropylene hollow fiber separation membrane, concrete steps are as follows:

[0037](1) Add polypropylene and diluent in the spinning kettle with stirring device, the mass fraction of polypropylene is 25%, the melt index is 2.7g / 10min, with soybean oil as diluent, the mass fraction of diluent is 75% %, heated to 200°C, and stirred for 0.5 hours under the condition of nitrogen flow, stopped the stirring and left to stand at constant temperature for degassing for 0.5 hours to obtain the casting solution;

[0038] (2) The casting liquid (temperature 200°C) is filtered through a 100-mesh stainless steel filter, and the casting liquid is transported to the spinneret by a gear-type metering pump, and nitrogen is introduced into the spinneret as the inner core liquid to form a hollow fiber. The temperature of the spinneret is 175°C; when the hollow fiber is extruded, it first passes through an air gap of 1 cm, then enters soybean oil...

Embodiment 2

[0042] A kind of preparation method of improved polypropylene hollow fiber separation membrane, concrete steps are as follows:

[0043] (1) Add polypropylene and diluent to the spinning kettle with a stirring device, the mass fraction of polypropylene is 40%, the melt index is 8g / 10min, dilute with the mixture of soybean oil and dioctyl phthalate The mass fraction of dioctyl phthalate in the mixture is 10%, the mass fraction of diluent is 60%, heat to 175°C, and stir for 3 hours under the condition of blowing nitrogen, stop stirring and let stand at constant temperature for defoaming for 2 hour, obtain casting solution;

[0044] (2) The casting liquid (temperature 175°C) is filtered through a 100-mesh stainless steel filter, and the casting liquid is transported to the spinneret by a gear-type metering pump, and nitrogen is introduced into the spinneret as the inner core liquid to form a hollow fiber. The temperature of the spinneret is 140°C; to extrude the hollow fiber, fir...

Embodiment 3

[0048] A kind of preparation method of improved polypropylene hollow fiber separation membrane, concrete steps are as follows:

[0049] (1) Add polypropylene resin and diluent in the spinning kettle with stirring device, the mass fraction of polypropylene is 27%, the melt index is 3g / 10min, take the mixture of soybean oil and dibutyl phthalate as Diluent, the mass fraction of dibutyl phthalate in the mixture is 90%, the mass fraction of diluent is 73%, heat to 180°C, and stir for 1 hour under the condition of nitrogen flow, stop stirring and stand at constant temperature for defoaming 1 hour to obtain the casting solution;

[0050] (2) The casting liquid (temperature 180°C) is filtered through a 100-mesh stainless steel filter, and the casting liquid is transported to the spinneret by a gear-type metering pump, and nitrogen is introduced into the spinneret as the inner core liquid to form a hollow fiber. The temperature of the spinneret is 145°C; to extrude the hollow fiber, ...

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Abstract

The invention relates to an improved preparation method of a polypropylene hollow fiber separation membrane. The invention belongs to the field of high-molecular material science. The method comprises the steps that: (1) polypropylene and a diluent are added into a kettle with a stirring device; heating and stirring are carried out, such that a membrane casting liquid is obtained; and when stirring is stopped, the liquid is subjected to standing and defoaming for 0.5-2h; (2) the membrane casting liquid is filtered by using a filter; an inner core liquid is introduced into a spinning nozzle, wherein a nozzle temperature is 145-165 DEG C; the inner core liquid and the membrane casting liquid are extruded by the spinning nozzle; the mixture first passes through air atmosphere, and then enters a multi-stage coagulating bath; the membrane casting liquid is cooled by the multi-stage coagulating bath, and the hollow fiber membrane is obtained by curing; (3) the hollow fiber membrane is wound by using a winding machine, and is extracted in one or a plurality of extraction agents; and (4) the extracted membrane is fetched and dried; and extraction agent is removed, such that the polypropylene hollow fiber separation membrane is obtained. With the method provided by the invention, under a same condition, a membrane flux is improved from 15 / m<2>.h of one-stage water coagulating bath to higher than 1200 / m<2>.h of two-stage coagulating bath.

Description

technical field [0001] The invention belongs to the field of polymer material science, relates to a preparation method of a polymer separation membrane, and more specifically relates to a method for coagulating a double coagulation bath of a casting liquid in the preparation process of a polypropylene hollow fiber separation membrane. Background technique [0002] A polymer separation membrane is a polymer interface that separates two homogeneous substances. With the development of membrane science and technology, polymer separation membranes have been widely used in water treatment, chemical industry, electronics, steel, medical treatment, food and other industries. As a polyolefin material, polypropylene is a highly crystalline thermoplastic resin polymerized mainly from propylene monomers. It has high transparency, non-toxicity, light specific gravity, easy processing, high impact strength, chemical corrosion resistance, and Flexibility, good electrical insulation and ot...

Claims

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Application Information

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IPC IPC(8): B01D71/26B01D69/08
Inventor 王玉杰奚振宇杨永强张新妙
Owner CHINA PETROLEUM & CHEM CORP
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