Separation membrane, method for manufacturing same, membrane module for at least one of deaeration and aeration, and device for at least one of deaeration and aeration
AssigneeToray Industries, Inc.
InventorsMiku Akutsu, Marina Taguchi, Shigeru Aoyama, Gohei Yamamura
Life of this patent
Estimating the term…
Abstract
Provided is a separation membrane including poly (4-methyl-1-pentene) as a main component, in which an average pore diameter converted from an NKP plot is 0.10 nm to 1.00 5 nm, a porosity is 40% to 70%, and when the separation membrane is sequentially divided into five regions which are defined as regions 1 to 5 from one surface of the separation membrane in a thickness direction at equal intervals, a pore diameter variation coefficient ai of a region i is 0% to 150% in all of the regions 1 to 5.
Claims15
A separation membrane comprising poly (4-methyl-1-pentene) as a main component, wherein
- an average pore diameter converted from an NKP plot is 0.10 nm to 1.00 nm,
- a porosity is 40% to 70%, and
- when the separation membrane is sequentially divided into five regions which are defined as regions 1 to 5 from one surface of the separation membrane in a thickness direction at equal intervals, a pore diameter variation coefficient ai of a region i is 0% to 150% in all of the regions 1 to 5.
A method for manufacturing a separation membrane, the method comprising:
- (1) a preparation step of melt-kneading a mixture containing 10 mass % or more and 50 mass % or less of poly (4-methyl-1-pentene) and 50 mass % or more and 90 mass % or less of a plasticizer to obtain a resin composition;
- and
- (2) a forming step of ejecting the resin composition from an ejection die, exhausting a volatilized plasticizer at a wind speed of 8 m/s to 20 m/s, and then immersing the resin composition in a cooling bath using a solvent having a solubility parameter distance Ra for poly (4-methyl-1-pentene) of 5.0 MPa1/2 or more and 18 MPa1/2 or less and a solubility parameter distance Rb for the plasticizer of 1.0 MPa1/2 or more and 2.9 MPa1/2 or less or 6.5 MPa1/2 or more and 10.0 MPa1/2 or less, followed by winding the resin composition.
Dependencies are inferred from the claim text.