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Chemistry and Industry of Forest Products ›› 2018, Vol. 38 ›› Issue (6): 103-109.doi: 10.3969/j.issn.0253-2417.2018.06.014

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Preparation and Characterization of Lignin Based Phenolic Foam

ZHOU Fanglang1,2, ZHENG Zhifeng2, YANG Jing2, YANG Haiyan2, DENG Jia1, SHI Zhengjun2   

  1. 1. Key Laboratory for Forest Resources Conservation and Use in the Southwest Mountains of China, Southwest Forestry University, Kunming 650224, China;
    2. University Key Laboratory of Biomass Chemical Refinery & Synthesis, Southwest Forestry University, Kunming 650224, China
  • Received:2018-08-13 Online:2018-12-25 Published:2018-12-27

Abstract: Lignin was used to partially replaced phenol andreact with formaldehyde to form a lignin based phenolic resin under alkaline condition. Then this lignin based phenolic resin was applied to prepared a foam by foaming process. When the replacement percentages of phenol by lignin were 0%, 10%, 20%, and 30%, the phenolic foams were denoted as LPF-0%, LPF-10%, LPF-20%, LPF-30%, respectively. The research results on the properties of phenolic foams showed that lignin could partially replace the phenol and carry out condensed reaction with formaldehyde to form phenolic resin. Four kinds of lignin-based phenolic foam had good thermal stability.The maximum carbon residue of foam was 54.60% when the replacement percentage of phenol by lignin was 20% (LPF-20%), and the thermal stability was better than other phenolic foams. As the substitution amount of lignin increased, the color of lignin-based phenolic foam gradually changed from yellow to brown,its density increased from 0.05 g/cm3 to 0.11 g/cm3, and the compressive strength increased from 0.26 MPa to 0.56 MPa, the degree of surface power decreased from 13.73% to 3.48%, and the water absorption rate decreased from 3.73% to 1.92%.Lignin-based phenolic foam showed a good flame retardant property and the oxygen index of LPF-30% was as high as 33.67%.

Key words: lignin, phenolic foam, preparation, properties characterization

CLC Number: