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High-Performance Multiscale LNPs from Black Liquor as Repulpable Paper Coatings with Enhanced Water, Oil, and Vapor
Wen Chen1, Zhenyu Zhou2, Dahang Zha1,3
1International Innovation Center for Forest Chemicals and Materials, Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources and Jiangsu Provincial Key Lab of Sustainable Pulp and Paper Technology and Biomass Materials, Nanjing Forestry University, Nanjing 210037, China.
Abstract:
Technical lignin in alkaline pulping black liquor is usually combusted for energy in a soda recovery unit. To improve resource utilization, multiscale lignin nanoparticles (LNPs) were acid precipitated from black liquor and combined with gelatinized starch (SS) to produce a series of uniformly mixed surface coating agents to enhance the barrier properties of paper materials including water, oil, and water vapor resistance. The coating with 20%SS and 50%LNPs (based on oven-dried SS) with a diameter of 276 nm could significantly improve the barrier properties of the coated paper. Cobb 60 decreased by 79.6% from 67.98 to 13.86 g/m2, Kit rating improved from 0 to 10, and water vapor transmission reduced from ≥3000 to 441.69 g/m2·day. The coated paper presented superior mechanical properties, thermal stability, repulpability, and biodegradability. This work provides an effective strategy for the high-value application of pulping black liquor and holds promise for paper-based packaging.
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