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Polyphenylene sulfide porous film and preparation thereof

A polyphenylene sulfide and porous membrane technology, applied in the field of polyphenylene sulfide porous membrane and its preparation, can solve the problems of high temperature resistance, poor solvent resistance, and limited industrial applicability, and achieve high porosity and high strength , the effect of narrow pore size distribution

Inactive Publication Date: 2008-08-06
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the limitation of the characteristics of the membrane material itself, its high temperature resistance and solvent resistance are not good, which limits its industrial applicability

Method used

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  • Polyphenylene sulfide porous film and preparation thereof
  • Polyphenylene sulfide porous film and preparation thereof
  • Polyphenylene sulfide porous film and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The number average molecular weight of polyphenylene sulfide is 90,000, and the diluent is diphenyl ether. Its components are 30% by mass of polyphenylene sulfide and 70% by mass of diphenyl ether. Heat up to 260°C in a high-temperature stirred tank, stir and mix evenly. The resulting homogeneous solution of the polymer was coated directly on the template. The cooling bath chooses water as the cooling liquid. Immersed in cooling liquid to make the solution phase-separated and solidified to form a film, then extracted with acetone and dried. The thickness of the obtained flat porous membrane is 150 μm, the cross-sectional pore structure of the membrane is a branch-like pore structure, the internal average pore diameter is 0.09 μm, and the porosity is 80%. The pore structure is as follows: figure 1 shown. At 25°C, the pure water flux is 1000L / m 2 ·hr·0.1MPa. Below 180°C, the pore structure and pure water flux remained basically unchanged after soaking the membrane i...

Embodiment 2

[0024] The number average molecular weight of polyphenylene sulfide is 90,000, and the diluent is diphenyl ether and benzophenone. Its components are 15% by mass of polyphenylene sulfide, 40% by mass of diphenyl ether and 45% by mass of benzophenone. Heat up to 260°C in a high-temperature stirred tank, stir and mix evenly. The resulting homogeneous solution of the polymer was coated directly on the template. The cooling bath chooses water as the cooling liquid. Immersed in cooling liquid to make the solution phase-separated and solidified to form a film, then extracted with acetone and dried. The thickness of the obtained flat porous membrane is 150 μm, the cross-sectional pore structure of the membrane is a branch-like pore structure, the internal average pore diameter is 0.2 μm, and the porosity is 85%. The pore structure is as follows: figure 2 shown. At 25°C, the pure water flux is 1500L / m 2 ·hr·0.1MPa. Below 180°C, the pore structure and pure water flux remained ba...

Embodiment 3

[0026] The number average molecular weight of polyphenylene sulfide is 90,000, and the diluent is diphenyl sulfone. Its components are 40% by mass of polyphenylene sulfide and 60% by mass of diphenyl sulfone. Heat up to 260°C in a high-temperature stirred tank, stir and mix evenly. The resulting homogeneous solution of the polymer was coated directly on the template. The cooling bath chooses water as the cooling liquid. Immersed in cooling liquid to make the solution phase-separated and solidified to form a film, then extracted with acetone and dried. The thickness of the obtained flat porous membrane is 150 μm, the cross-sectional pore structure of the membrane is a spheroidal pore structure, the internal average pore diameter is 0.15 μm, and the porosity is 80%. The pore structure is as follows: image 3 shown. At 25°C, the pure water flux is 1200L / m 2 ·hr·0.1MPa. Below 180°C, the pore structure and pure water flux remained basically unchanged after soaking the membran...

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Abstract

The invention discloses a porous membrane of polyphenylene sulfide and a preparation method thereof. The porous membrane of polyphenylene sulfide provided by the invention is prepared by the polyphenylene sulfide with the inner pore diameter of 0.09 to 0.2Mum and porosity rate of 70 to 90 percent. The invention adopts the polyphenylene sulfide with excellent performance as the membrane material which is dissolved at the high temperature and then heterogeneous separated at low temperature to prepare the porous membrane of polyphenylene sulfide of high strength, high temperature resistance and solvent-resistance. Compared with the porous membranes of polyvinylidene fluoride, polyethylene and polypropylene, the porous membrane of polyphenylene sulfide has the advantages of narrowly distributed pore diameter, high porosity rate, high strength, high temperature resistance and solvent-resistance which can be widely applied to the fields such as micro-filtration and ultra-filtration, especially the membrane process of ultra-filtration and micro-filtration at high temperature, and even can replace the inorganic membrane.

Description

technical field [0001] The invention relates to a polyphenylene sulfide porous membrane and a preparation method thereof. Background technique [0002] The Thermally Induced Phase Separation (TIPS) method is a method for making microporous membranes that emerged in the 1980s. It is especially suitable for membranes that cannot be formed by the non-lyotropic phase separation (NIPS) method without a suitable solvent at room temperature. of polymers. Compared with the dry and wet methods of the NIPS method, the TIPS method has at least the following advantages: fewer influencing factors, easier control of the film forming process, higher strength of the formed film, and higher porosity. After years of development, the TIPS method has been applied industrially. The porous membrane prepared by the TIPS method is mainly used for wastewater treatment, reclaimed water reuse, and upper water treatment through membrane processes such as microfiltration and ultrafiltration. [0003] ...

Claims

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Application Information

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IPC IPC(8): B01D71/66
Inventor 丁怀宇施艳荞陈观文张强
Owner INST OF CHEM CHINESE ACAD OF SCI
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