Silvered aramid conductive fiber and preparation method thereof

Abstract

The invention provides a silvered aramid conductive fiber and a preparation method thereof. The preparation method is conducted according to the steps as follows: a. coarsening: coarsening the aramid fiber through putting the fiber into a mixed solution of sodium hydroxide, absolute ethanol and the balance of water, and neutralizing the fiber by rinsing; b. hydrolyzing: hydrolyzing the coarsened aramid fiber by putting the fiber into an acid solution; c. activation of palladium salt: activating the hydrolyzed aramid fiber subjected to activation of palladium salt in step b by putting the fiber into a mixed solution of hydrochloric acid, palladium chloride, stannous chloride and the balance of water; d. reducing: reducing the palladium salt activated aramid fiber in step c by putting the fiber into a mixed solution of hydrochloric acid, sodium hypophosphite and the balance of water; e. chemical silvering: chemical silvering the reduced aramid fiber in step d by putting the fiber into a chemical silvering solution of silver nitrate, sodium hydroxide, aqua ammonia, a complex agent, a reducing agent and the balance of water; f. drying: drying the chemical silvered aramid fiber in step e in the conventional manner to obtain the silvered aramid conductive fiber.

Description

technical field [0001] The invention belongs to the field of conductive fibers, and relates to an aramid silver-plated conductive fiber and a preparation method thereof. Background technique [0002] Because aramid fiber has the characteristics of low density, high strength, and good thermal stability, the conductive fiber prepared by using aramid fiber as the base material not only endows the aramid fiber with good conductivity, but also inherits the excellent performance of the aramid matrix. Other polyester-based silver-plated fibers are mainly used for home visits, medical treatment and sporting goods. Such products will melt, drip or burn when exposed to fire or high heat, which will easily cause secondary burns to users, and it is difficult to meet high-strength, high-resistance thermal performance requirements. Conductive fibers prepared from aramid fibers can also provide electromagnetic shielding materials for aerospace equipment. [0003] However, aramid fiber is...

AI Technical Summary

Problems solved by technology

[0003] However, aramid fiber is a rigid macromolecule with high crystallinity and high degree of orientation. There are a large number of aromatic rings in the aramid fiber molecule, which makes the surface of aramid fiber inert and chemically active, making it difficult to achieve metal adhesion.

"Preparation and Properties of Silver-plated Conductive Aramid Fiber" carried out by Liang Jingjing, Zou Xinguo and others requires the use of a special metallization reagent (NaH-DMSO), which is complicated in process, and the coating uniformity and adhesion are not good. In the stage of laboratory research, unable to meet the needs of large-scale production

The invention patent 201210425097.1 of Duan Yonghua et al. "A method for metallizing the surface of aramid fiber" uses a copper-nickel metal layer, the coating is brittle, the fiber hardness is high, and the bonding force and electrical conductivity are poor.