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4. Plastic-free, oil- and water-resistant paper for food packing.

Author

Li, Peiyi, Zhou, Xinyao, Jian, Boxing, Zhou, Miaomiao, Liu, Ruiyan, Sun, Bolong, Li, Xinping, Wang, Yun, and Zhou, Bingyao

Subjects
BIODEGRADABLE plastics, CONTACT angle, FOOD packaging, SCANNING electron microscopy
Abstract

Traditional food packaging coated paper is not environmentally friendly, and there have been many studies on oil- and water-resistant paper for food packaging. However, preparing oil- and water-resistant paper that is plastic-free, fluorine-free, and environmentally friendly is still a significant challenge. In this study, oil- and water-resistant paper for food packaging are prepared by layer-by-layer assembly and mixing coating methods. The layer-by-layer assembly coated paper exhibits excellent water resistance (Cobb 60 value of 20.5 g/m2, water contact angle value of 132°). The mixed coated paper not only has good water resistance (Cobb 60 value of 27.1 g/m2, water contact angle value of 131°), but also has excellent oil resistance (kit rating value of 8/12). The oil-resistant and waterproof mechanism of the coated paper is confirmed through scanning electron microscopy. In addition, the mechanical performance and coating adhesion of the mixed coated paper are the best, with an increase in the tensile index of 73.1 %. This study provides a feasible strategy for preparing biodegradable, plastic-free, and fluorine-free food packaging oil- and water-resistant paper, which is beneficial for reducing plastic pollution. [ABSTRACT FROM AUTHOR]

Published
2024
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8. Preparation of cellulose nanofibrils from okara by high pressure homogenization method using deep eutectic solvents

Author

Lei Haozhe, Jian Boxing, Xinping Li, Qingqing Hou, Yumeng Wang, Peiyi Li, and Liu Hezhen

Subjects
Polymers and Plastics, Oxalic acid, Extraction (chemistry), 02 engineering and technology, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, 0104 chemical sciences, Solvent, chemistry.chemical_compound, chemistry, Chemical engineering, Degreasing, Nanofiber, Glycerol, Urea, Cellulose, 0210 nano-technology
Abstract

The interest in the application of deep eutectic solvents (DES) as a green solvent has increased rapidly. The application of DES in agro-industrial okara treatment can be developed into industrialization. In order to simplify the degreasing, deproteinization and cellulose extraction steps in the process of pretreating okara cellulose, a new approach to cellulose extraction from okara via one-pot DES treatment is established. Three different complexing agents, choline salts in oxalic acid, in glycerol and in urea are studied in this work. The structure and properties of cellulose nanofibers (CNFs) prepared by high pressure homogenization following pretreatment of okara with anionic systhesized DES are investigated. The effects of different systems on the degree of microfibrillation of okara are analyzed using techniques such as SEM, FTIR, TD and DTG. The results indicate that by pretreating okara with choline chloride–oxalic acid type solvent, CNFs with average diameter of 27 nm are obtained using high pressure homogenization.

Published
2020

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