US 12,330,122 B2
Preparation method for chelating membrane for purifying wet electronic chemicals
Xiaobin Ding, Jiangsu (CN); Fenjuan Xiangli, Shandong (CN); Pingping Dai, Jiangsu (CN); and Cheng Wang, Jiangsu (CN)
Assigned to JIANGSU JIUMO HI-TECH CO., LTD., Jiangsu (CN); and SHANDONG RESEARCH INSTITUTE OF LONG MEMBRANE TECHNOLOGY DEVELOPMENT CO., LTD., Shandong (CN)
Appl. No. 18/836,726
Filed by JIANGSU JIUMO HI-TECH CO., LTD., Jiangsu (CN); and SHANDONG RESEARCH INSTITUTE OF LONG MEMBRANE TECHNOLOGY DEVELOPMENT CO., LTD., Shandong (CN)
PCT Filed Jul. 19, 2023, PCT No. PCT/CN2023/108034
§ 371(c)(1), (2) Date Aug. 7, 2024,
PCT Pub. No. WO2024/002382, PCT Pub. Date Jan. 4, 2024.
Claims priority of application No. 202210751020.7 (CN), filed on Jun. 28, 2022.
Prior Publication US 2025/0144570 A1, May 8, 2025
Int. Cl. B01D 67/00 (2006.01); B01D 69/02 (2006.01); B01D 71/36 (2006.01)
CPC B01D 67/0088 (2013.01) [B01D 67/0083 (2013.01); B01D 67/009 (2013.01); B01D 67/0095 (2013.01); B01D 67/0097 (2013.01); B01D 69/02 (2013.01); B01D 71/36 (2013.01); B01D 2323/02 (2013.01); B01D 2323/081 (2022.08); B01D 2323/12 (2013.01); B01D 2323/56 (2022.08); B01D 2325/36 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A preparation method for a chelating membrane for purifying wet electronic chemicals, comprising the following steps:
performing hydrophilic treatment on a porous PTFE membrane to obtain a hydrophilic base membrane;
sequentially cleaning a chelating resin with a hydrochloric acid solution, a sodium hydroxide solution and deionized water, and then drying, wherein the chelating resin is an iminodiacetic acid chelating resin;
grinding and sieving the cleaned and dried chelating resin to obtain a powder;
mixing the powder with the polyisobutylene and the polyhexafluoroethylene emulsion at 150-200° C. for 4-8 h, and carrying out vacuum defoaming for 3-6 h to form the membrane coating solution; and a mass ratio of the powder to the polyisobutylene to the polyhexafluoroethylene emulsion is (60-75):(5-10):(15-35); and
coating the hydrophilic base membrane with the membrane coating solution to prepare a chelating membrane.