US 12,240,924 B2
Highly alkali-stable cationic polymers and their preparation methods and applications
Haibing Wei, Hefei (CN); Tao Wang, Hefei (CN); Hongfang Zhu, Anqing (CN); Yatao Liang, Anqing (CN); Ming Xu, Hefei (CN); Duoying Chen, Hefei (CN); and Yunsheng Ding, Hefei (CN)
Assigned to HEFEI UNIVERSITY OF TECHNOLOGY, (CN); and ANQING POLYROCKS TECHNOLOGY RESEARCH CO., LTD., (CN)
Filed by HEFEI UNIVERSITY OF TECHNOLOGY, Hefei (CN); and ANQING POLYROCKS TECHNOLOGY RESEARCH CO., LTD., Anqing (CN)
Filed on May 2, 2024, as Appl. No. 18/652,840.
Claims priority of application No. 202311481623.0 (CN), filed on Nov. 6, 2023.
Prior Publication US 2024/0317902 A1, Sep. 26, 2024
Int. Cl. C08F 2/06 (2006.01); B01J 37/00 (2006.01); C08F 26/06 (2006.01)
CPC C08F 2/06 (2013.01) [B01J 37/0009 (2013.01); C08F 26/06 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A preparation method of highly alkali-stable cationic polymers, comprising the following steps:
s1. placing a polymerization compound mixture comprising 1-R1-3-piperidinone or its salts or hydrate thereof and arenes in a first organic solvent, performing catalytic polycondensation by adding organic strong acids, performing the reaction at −20-100° C. for 0.1-200 h, and obtaining a polymer dispersion comprising the piperidine moieties;
in s1, 1-R1-3-piperidinone having the following formula:

OG Complex Work Unit Chemistry
R1 is independently selected from H, C1-20-hydrocarbyl;
in s1, arenes having one or more of the following structures:

OG Complex Work Unit Chemistry
s2. slowly dropping the polymer dispersion from s1 with piperidine moieties into a first precipitant, filtering and washing the obtained fibrous polymer, and obtaining a polymer powder with piperidine moieties after vacuum drying;
s3. dissolving the polymer powder from s2 with piperidine moieties in a second organic solvent, then adding the quaternization reagent, obtaining a cationic polymer solution after a quaternization reaction at 0-100° C. for 0.1-200 h;
the quaternization reagents are dimethyl sulfate or halogenated hydrocarbons comprising 1 to 20 C atoms;
s4. slowly adding the cationic polymer solution from s3 to a second precipitant, and obtaining a cationic polymer powder by filtration and drying;
s5. immersing the cationic polymer powder from s4 in a solution containing other types of counterions for ion exchanging to obtain a cationic polymer containing other types of counterions.