Microporous and hydrophobic polymeric hollow fiber membranes and methods for preparation thereof
First Claim
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1. A method for preparing a microporous hollow fiber membrane, which comprises:
- mixing at least one polymer suitable for melt extrusion with at least one suitable water soluble salt having an average particle size of about 1 to about 20 μ
m under conditions suitable to form a mixture comprising about 60 to about 70% by weight of the at least one suitable water soluble salt based on the total weight of the mixture;
extruding the mixture under conditions suitable to form a hollow fiber membrane comprising the mixture; and
leaching the hollow fiber membrane comprising the mixture in water under conditions suitable for at least substantially removing the salt from the hollow fiber membrane,said prepared microporous hollow fiber membrane having a water contact angle of about 110 to about 140° and
a porosity of about 40 to about 60%.
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Abstract
There is provided a method for preparing microporous hollow fiber membranes comprising melt-extruding a polymer-salt blend followed by salt leaching. Microporous hollow fiber membranes are also disclosed.
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Citations
26 Claims
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1. A method for preparing a microporous hollow fiber membrane, which comprises:
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mixing at least one polymer suitable for melt extrusion with at least one suitable water soluble salt having an average particle size of about 1 to about 20 μ
m under conditions suitable to form a mixture comprising about 60 to about 70% by weight of the at least one suitable water soluble salt based on the total weight of the mixture;extruding the mixture under conditions suitable to form a hollow fiber membrane comprising the mixture; and leaching the hollow fiber membrane comprising the mixture in water under conditions suitable for at least substantially removing the salt from the hollow fiber membrane, said prepared microporous hollow fiber membrane having a water contact angle of about 110 to about 140° and
a porosity of about 40 to about 60%.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 20, 21, 22, 23, 24, 25)
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18. A microporous hydrophobic hollow fiber membrane comprising:
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a porosity of about 40 to about 60%; a mean roughness (Ra) of about 600 nm to about 800 nm; a water contact angle of about 110 to about 140°
; andmicroporous pores having an average diameter of about 1 to about 20 μ
m. - View Dependent Claims (19, 26)
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Specification