To Produce Electromagnetic Shielding Material from Lignin of Black Liquor

Abstract:

Lignin was obtained from black liquor of papermaking by the acid to separation, and carbonized after loading various amounts of nickel and calcium or nickel alone. The influences of the temperature, amount of nickel and amount of calcium on the crystallized size (Lc) and the electromagnetic shielding (EMS) capacities in the range of 50~800 MHz for the chars from lignin were investigated. The results showed that Lc and EMS capacities in the entire of frequency of the chars with 6wt% calcium increased with increasing amount of the nickel loaded and also increased with increasing carbonization temperature from 700 to 900°C. Some amounts of calcium significantly enhanced the formation of crystallized carbon. Lc and EMS capacities of the chars with loaded 8wt% nickel increased with increasing amount of calcium and then decreased. It was founded that chars of lignin with co-loading of 8wt% nickel and 6wt% calcium were suitable as EMS materials with exceeding a practical standard of EMS capacity (30dB) in the range of 50~800 MHz.

• Periodical: Applied Mechanics and Materials (Volumes 548-549)
• Pages: 129-132
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.548-549.129
• Online since: April 2014
• Authors: Fei Fei Chen, Yu Qing Xiong, Shi Lei Du
• Keywords: Carbonization, Electromagnetic Shielding Material, Lignin, Nickel Catalyst

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