US 11,898,303 B2
Surface-modified aramid fiber and preparation method therefor
Aijuan Gu, Suzhou (CN); Hua Cai, Suzhou (CN); Guozheng Liang, Suzhou (CN); and Li Yuan, Suzhou (CN)
Assigned to SOOCHOW UNIVERSITY, Suzhou (CN)
Appl. No. 17/052,903
Filed by SOOCHOW UNIVERSITY, Suzhou (CN)
PCT Filed May 10, 2018, PCT No. PCT/CN2018/086408
§ 371(c)(1), (2) Date Nov. 4, 2020,
PCT Pub. No. WO2019/210529, PCT Pub. Date Nov. 7, 2019.
Claims priority of application No. 201810422356.2 (CN), filed on May 4, 2018.
Prior Publication US 2021/0222358 A1, Jul. 22, 2021
Int. Cl. D06M 11/38 (2006.01); D06M 11/36 (2006.01); D06M 11/80 (2006.01); D06M 13/513 (2006.01); D06M 15/61 (2006.01); D06M 101/36 (2006.01)
CPC D06M 11/38 (2013.01) [D06M 11/36 (2013.01); D06M 11/80 (2013.01); D06M 13/513 (2013.01); D06M 15/61 (2013.01); D06M 2101/36 (2013.01)] 4 Claims
 
1. A method for preparing a surface-modified aramid fiber, comprising the following steps:
(1) immersing a surface-cleaned aramid fiber in an alkali metal hydroxide alcohol solution having a mass concentration of 5.0 to 15.0%, and shaking and reacting at 65° C. for 5 hours to obtain an aramid fiber grafted with amino and carboxyl groups on a surface thereof;
(2) immersing the aramid fiber grafted with amino and carboxyl groups in an organic solvent containing γ-glycidoxypropyltrimethoxysilane under an inert gas atmosphere, and reacting at 70° C. for 12 hours to obtain a silicon methoxylated aramid fiber;
(3) dissolving a cerium salt and an inorganic base in water, stirring for 35 minutes, adding hydrogen peroxide to obtain a suspension, adjusting a pH of the suspension to 12, reacting at 40° C. for 12 hours, washing and filtering, drying, calcining at 700° C. for 2 hours to obtain a nano-cerium oxide; dispersing the nano-cerium oxide, a boron source and a nitrogen-containing compound in a mixed solution of ethanol and water, ultrasonically stirring for 1 hour, steaming and drying, calcining at 950° C. for 5 hours under a nitrogen source gas to obtain cerium oxide particles coated with boron nitride;
(4) adding the cerium oxide particles coated with boron nitride and dopamine hydrochloride to a buffer having a pH of 8.5, and stirring at room temperature for 6 hours; filtering, washing, and drying to obtain a cerium oxide coated with polydopamine modified boron nitride;
(5) immersing the silicon methoxylated aramid fiber in an aqueous solution of the cerium oxide coated with polydopamine modified boron nitride, and shaking at 60° C. for 6 hours; washing and drying to obtain the surface modified aramid fiber,
wherein the aramid fiber is a para-aramid fiber or a meta-aramid fiber; the alkali metal hydroxide is sodium hydroxide; the inorganic base is sodium hydroxide; the inert gas is nitrogen gas; the organic solvent is ethanol; the cerium salt is cerium chloride; the boron source is boric acid; the nitrogen-containing compound is urea; the nitrogen source gas is nitrogen; and the buffer is Tris-HCl.