US 12,404,627 B2
Cross-linked enhanced meta-aramid and preparation method therefor
Zhenhong Guan, Yantai (CN); Zhongkai Ren, Yantai (CN); Shidong Pan, Yantai (CN); Dan Li, Yantai (CN); Xubo Zhou, Yantai (CN); and Wenhua Yang, Yantai (CN)
Assigned to TAYHO ADVANCED MATERIALS GROUP CO., LTD., Shandong (CN)
Filed by Yantai Tayho Advanced Materials Co. Ltd., Yantai (CN)
Filed on Feb. 25, 2022, as Appl. No. 17/680,363.
Application 17/680,363 is a continuation of application No. PCT/CN2020/102922, filed on Jul. 20, 2020.
Claims priority of application No. 201910818877.4 (CN), filed on Aug. 30, 2019.
Prior Publication US 2022/0259797 A1, Aug. 18, 2022
Int. Cl. D06M 13/395 (2006.01); D06M 101/36 (2006.01)
CPC D06M 13/395 (2013.01) [D06M 2101/36 (2013.01)] 7 Claims
 
1. A preparation method for a cross-linking enhanced meta-aramid, comprising: placing meta-aramid precursor fibers in an organic solution of isocyanate containing a catalyst, letting stand for reaction to obtain a cross-linked meta-aramid, and subjecting the cross-linked meta-aramid to water washing, drying, and heat setting to obtain the cross-linking enhanced meta-aramid, wherein:
the isocyanate is selected from one or more of 2,4-toluene diisocyanate, 2,6-toluene diisocyanate, 4,4′-diphenylmethane diisocyanate, naphthyl 1,5-diisocyanate, p-phenylene diisocyanate, and triphenylmethane triisocyanate;
in the organic solution of isocyanate containing the catalyst, a mass content of the isocyanate ranges from 1% to 10%, a mass content of the catalyst ranges from 0.5% to 3%, and the balance is an organic solvent; and
the cross-linking enhanced meta-aramid has a structural formula of:

OG Complex Work Unit Chemistry
where 80≤n≤150, 80≤x≤150, 80≤m≤150; and
R is selected from one or more of

OG Complex Work Unit Chemistry