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Thermal phase-separating process for preparing microporous film of hollow polypropylene fibres

A technology of thermally induced phase separation and polypropylene, which is applied in fiber processing, textile and papermaking, filament/thread forming, etc., and can solve the problems of small inner diameter of hollow fiber, easy pollution, limited application range of membrane, and irregular pore shape, etc. question

Inactive Publication Date: 2002-07-03
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the membrane made by this method, the holes formed on the hollow fiber membrane wall are torn by pulling force, so the hole shape is irregular, the pore size range is difficult to control, the hollow fiber inner diameter is small and easy to be polluted, and the application range of the membrane is limited.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] 1. Add polypropylene, soybean oil and adipic acid to the melting tank, the ratio is: 50:49:1.

[0010] 2. Heat the material to 165°C under stirring and nitrogen protection, melt and form a homogeneous solution, and let it stand for defoaming.

[0011] 3. Control the nitrogen pressure to 5 mm of water column, the pressure in the melt tank to 0.15 MPa, and the spinneret temperature to 160° C., so that the homogeneous melt solution is spun into polypropylene hollow fibers through the spinneret.

[0012] 4. After the polypropylene hollow fiber is spun in a 50mm process, it is solidified in water at 50°C, and the winding speed is controlled at 120mm / s.

[0013] 5. Extract soybean oil with n-hexane to obtain polypropylene hollow fiber membrane.

[0014] The porosity of the prepared polypropylene hollow fiber membrane is 45.5%, and the pure water flux is 0.1044kg / h.m 2 , the average pore diameter is 0.0475 microns, the outer diameter of the hollow fiber is 720 microns, and t...

Embodiment 2

[0016] 1. Add polypropylene, liquid paraffin and adipic acid to the melting pot, the ratio is: 50:49:1.

[0017] 2. Heat the material to 180°C under stirring and nitrogen protection, melt and form a homogeneous solution, and let it stand for defoaming.

[0018] 3. Control the nitrogen pressure to 5 mm of water column, the pressure in the melt tank to 0.2 MPa, and the spinneret temperature to 165° C., so that the homogeneous melt solution is spun into polypropylene hollow fibers through the spinneret.

[0019] 4. After the polypropylene hollow fiber is spun by 50mm air, it is solidified in water at 50°C, and the winding speed is controlled at 90mm / s.

[0020] 5. Extract the paraffin with gasoline to obtain the polypropylene hollow fiber membrane.

[0021] The porosity of the prepared polypropylene hollow fiber membrane is 49.2%, and the pure water flux is 0.07694kg / h.m 2 , the average pore diameter is 0.02886 microns, the outer diameter of the hollow fiber is 720 microns, and...

Embodiment 3

[0023] 1. Add polypropylene and diphenyl ether into the melt tank, the ratio is: 50:50.

[0024] 2. Heat the material to 170°C under stirring and nitrogen protection, melt and form a homogeneous solution, and let it stand for defoaming.

[0025] 3. Control the nitrogen pressure to 5 mm of water column, the pressure in the melt tank to 0.15 MPa, and the spinneret temperature to 165° C., so that the homogeneous melt solution is spun into polypropylene hollow fibers through the spinneret.

[0026] 4. After the polypropylene hollow fiber is spun in a 50mm process, it is solidified in water at 50°C, and the winding speed is controlled at 120mm / s.

[0027] 5. Extract diphenyl ether with n-hexane to obtain polypropylene hollow fiber membrane.

[0028] The porosity of the prepared polypropylene hollow fiber membrane is 42.32%, and the pure water flux is 0.03061kg / h.m 2 , the average pore diameter is 0.01858 microns, the outer diameter of the hollow fiber is 720 microns, and the wall...

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Abstract

A thermal phase-separating process for preparing millipore membrane of hollow polypropylene fibres from polypropylene includes preparing spinning solution from diluent (plant oil, atoleine, diphenyl ether and machine oil), assistant (adipic acid and benzoic acid) and polypropylene, heating, spinning, cooling, extracting diluent and recovering diluent. The pore diameter of resultant membrane is 0.01-0.1 micron, and is easily controlled.

Description

technical field [0001] The invention relates to a method for preparing a polypropylene hollow fiber microporous membrane by a heat-induced phase separation method. The invention belongs to the preparation technology of polypropylene hollow fiber membrane. Background technique [0002] Polypropylene hollow fiber membranes are favored by people for their remarkable characteristics of low preparation cost and easy availability of raw materials. At present, the main method for preparing polypropylene hollow fiber membranes is the melt spinning-cooling stretching method. Its main steps include: pure polymer→melt extrusion hollow fiber→cooling→stretching→heat setting→finished product. In the membrane made by this method, the holes formed on the hollow fiber membrane wall are torn by pulling force, so the hole shape is irregular, the pore size range is difficult to control, the hollow fiber inner diameter is small and easy to be polluted, and the application rang...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01D5/247
Inventor 李凭力王世昌张翠兰任延王志
Owner TIANJIN UNIV
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