	US 12,269,922 B2
	Method for preparing aramid nanofiber dispersion
Jeyoung Park, Ulsan (KR); Dong Yeop Oh, Busan (KR); Sung Yeon Hwang, Seoul (KR); Hyun Gil Cha, Ulsan (KR); Jong Geon Jegal, Ulsan (KR); Ho Jun Kim, Ulsan (KR); and Seul A Park, Ulsan (KR)
Assigned to KOREA RESEARCH INSTITUTE OF CHEMICAL TECHNOLOGY, Daejeon (KR)
Appl. No. 17/056,981
Filed by KOREA RESEARCH INSTITUTE OF CHEMICAL TECHNOLOGY, Daejeon (KR)
PCT Filed Mar. 19, 2019, PCT No. PCT/KR2019/003169 § 371(c)(1), (2) Date Nov. 19, 2020, PCT Pub. No. WO2019/225848, PCT Pub. Date Nov. 28, 2019.
Claims priority of application No. 10-2018-0057585 (KR), filed on May 21, 2018.
Prior Publication US 2021/0238348 A1, Aug. 5, 2021
Int. Cl. C08G 69/32 (2006.01); B01D 39/16 (2006.01); C08J 3/11 (2006.01); D01D 1/02 (2006.01); D01F 1/10 (2006.01); D01F 6/60 (2006.01)

CPC C08G 69/32 (2013.01) [B01D 39/1623 (2013.01); C08J 3/11 (2013.01); D01D 1/02 (2013.01); D01F 1/10 (2013.01); D01F 6/605 (2013.01); B01D 2239/025 (2013.01); B01D 2239/0618 (2013.01); B01D 2239/10 (2013.01); B01D 2239/1233 (2013.01); C08J 2377/10 (2013.01); D10B 2505/04 (2013.01)]

4 Claims

1. A method for preparing an aramid nanofiber dispersion comprising:

dissolving an aromatic polyamide-based polymer in a solution including a basic material and an aprotic polar solvent, while performing stirring so that an aramid nanofiber is produced,

wherein the aromatic polyamide-based polymer is a polymer in a form of a solid which is not spun into a fiber form,

wherein the stirring is performed at a temperature of 50° C. or lower and at a speed of 10-1000 rpm so that a time taken for the aromatic polyamide-based polymer to be dissolved and formed into an aramid nanofiber dispersion is 80 hours or less, wherein an aramid nanofiber in the aramid nanofiber dispersion has an average diameter of 1 to 100 nm and an average length of 0.1 to 100 μm, and wherein the basic material includes potassium hydroxide or sodium hydroxide.