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Chemistry and Industry of Forest Products ›› 2023, Vol. 43 ›› Issue (3): 1-8.doi: 10.3969/j.issn.0253-2417.2023.03.001

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Preparation and Properties of UV-shielded Film Derived from Full Components of Bagasse

Xun KE1, Yuanxing YANG1, Lihong ZHAO1,2,*()   

  1. 1. School of Light Industry Science and Engineering, South China University of Technology, Guangzhou 510640, China
    2. State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China
  • Received:2022-08-22 Online:2023-06-28 Published:2023-06-27
  • Contact: Lihong ZHAO E-mail:zhaolh@scut.edu.cn

Abstract:

In order to construct a new composite film material with all-component from biomass, ternary deep eutectic solvent consisting of choline chloride-oxalic acid dihydrate-glycerol(ChCl-OAd-Gly) was used to pretreat bagasse raw materials, and the treated residue was recombined with the dissolved components to obtain lignin-containing nanocellulose(LNC) by homogeniza-tion. The lignin-containing nanocellulose film(LNCF) functional materials was then prepared via vacuum-assisted and hot press methods. The influence of the lignin content on UV shielding properties, mechanical properties, water resistance, thermal stability and morphology of LNCF were studied using elemental analysis, atomic force microscopy(AFM), scanning electron microscopy(SEM), material universal tester, thermogravimetric analyzer and spectrophotometer. The results showed that with the lignin addition increase at 20% by volume, the lignin mass fraction in LNC increase 2-3 percentage point the diameter of LNC decrease slightly. The prepared LNCF exhibited good UV shielding effect, and the UV shielding rate in 200-400 nm and the visible light transmittance in 390-780 nm for LNCF-100% reached 99.68% and 65.46%, respectively. The addition of lignin enhanced the mechanical properties of LNCF, and its tensile strength increased from 76.61 MPa of LNCF-0% to 144.73 MPa of LNCF-100%. The hydrophobicity of LNCF was significantly improved. The water contact angle of LNCF-100% surface was 90.47°, and the water absorption rate of LNCF-0% without lignin reduced from 21.52% to 7.14%. Accordingly, the wet mechanical properties were maintained with the wet strength up to 77.3 MPa. Moreover, all six LNCF displayed good thermal stability, and the temperature of maximum pyrolytic weight loss was higher than 337 ℃。

Key words: deep eutectic solvent, bagasse, nanocellulose film, lignin

CLC Number: