US 12,440,808 B2
Polymer-based film, preparation method therefor, and use thereof
Yiqun Liu, Beijing (CN); Jing Wang, Beijing (CN); Guoyuan Pan, Beijing (CN); Yang Zhang, Beijing (CN); and Hao Yu, Beijing (CN)
Assigned to CHINA PETROLEUM & CHEMICAL CORPORATION, Beijing (CN); and BEIJING RESEARCH INSTITUTE OF CHEMICAL INDUSTRY, CHINA PETROLEUM & CHEMICAL CORPORATION, Beijing (CN)
Appl. No. 17/755,535
Filed by CHINA PETROLEUM & CHEMICAL CORPORATION, Beijing (CN); and BEIJING RESEARCH INSTITUTE OF CHEMICAL INDUSTRY, CHINA PETROLEUM & CHEMICAL CORPORATION, Beijing (CN)
PCT Filed Oct. 27, 2020, PCT No. PCT/CN2020/124164
§ 371(c)(1), (2) Date Apr. 30, 2022,
PCT Pub. No. WO2021/083162, PCT Pub. Date May 6, 2021.
Claims priority of application No. 201911057104.5 (CN), filed on Nov. 1, 2019; application No. 201911270854.0 (CN), filed on Dec. 12, 2019; and application No. 202010348806.5 (CN), filed on Apr. 28, 2020.
Prior Publication US 2022/0379266 A1, Dec. 1, 2022
Int. Cl. B01D 69/02 (2006.01); B01D 61/14 (2006.01); B01D 67/00 (2006.01); B01D 69/14 (2006.01); B01D 71/02 (2006.01); B01D 71/16 (2006.01); B01D 71/28 (2006.01); B01D 71/34 (2006.01); B01D 71/38 (2006.01); B01D 71/42 (2006.01); B01D 71/68 (2006.01); C02F 1/44 (2023.01); C02F 101/32 (2006.01)
CPC B01D 69/02 (2013.01) [B01D 61/147 (2013.01); B01D 67/0013 (2013.01); B01D 69/148 (2013.01); B01D 71/027 (2013.01); B01D 71/16 (2013.01); B01D 71/281 (2022.08); B01D 71/34 (2013.01); B01D 71/381 (2022.08); B01D 71/421 (2022.08); B01D 71/68 (2013.01); C02F 1/444 (2013.01); B01D 2323/12 (2013.01); B01D 2323/22 (2013.01); B01D 2325/026 (2013.01); B01D 2325/0281 (2022.08); B01D 2325/02834 (2022.08); B01D 2325/04 (2013.01); B01D 2325/36 (2013.01); C02F 2101/32 (2013.01)] 29 Claims
OG exemplary drawing
 
1. A membrane comprising:
a fiber skeletal structure of three-dimensionally interwoven and interconnected polymer fibers, and nano-scale protrusions which are distributed on and integrally formed with the fiber skeletal structure,
wherein:
the fiber skeletal structure and the nano-scale protrusions comprise a first polymer and a second polymer,
the first polymer is at least one selected from the group consisting of polysulfone, polyethersulfone, sulfonated polyethersulfone, polyacrylonitrile, cellulose acetate, polyvinylidene fluoride, polyimide, acrylonitrile-styrene copolymers, polyvinylidene fluoride modified by acrylic acid grafting, sulfonated polysulfone, maleic anhydride-grafted polysulfone, sulfonated polyethersulfone, and acrylic acid-grafted polyacrylonitrile, and
the second polymer is at least one selected from the group consisting of chitosan, polyvinylpyrrolidone, polyethylene glycol, polyvinyl alcohol, and polyoxyethylene polyoxypropylene ether block copolymer;
and
wherein:
a three-dimensionally interpenetrating network pore structure is distributed in the fiber skeletal structure, an average pore size of the pores is in a range of 0.1 μm to 10 μm,
a size of protrusions is in the range of from 20 to 400 nm, and
a volume porosity of the membrane is 50%-95%.