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Chemistry and Industry of Forest Products ›› 2021, Vol. 41 ›› Issue (3): 63-70.doi: 10.3969/j.issn.0253-2417.2021.03.009

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Synthesis and Thermal Analysis of Lignin-based Flame Retardant Containing Nitrogen and Phosphorus

Zhuo LI1(), Shuxian WENG1, Fei SONG2, Xiaoli REN1, Xiaohui YANG1,4, Lihong HU1,3,*()   

  1. 1. Institute of Chemical Industry of Forest Products, CAF; National Engineering Lab. for Biomass Chemical Utilization; Key Lab. of Chemical Engineering of Forest Products, National Forestry and Grassland Administration; Key Lab. of Biomass Energy and Material, Jiangsu Province, Nanjing 210042, China
    2. College of Chemical Engineering, Nanjing Forestry University, Nanjing 310037, China
    3. Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing 210037, China
    4. Research Institute of Forestry New Technology, CAF, Beijing 100091, China
  • Received:2021-01-26 Online:2021-06-28 Published:2021-07-01
  • Contact: Lihong HU E-mail:19852832112@163.com;hlh@icifp.cn


Using depolymerized lignin(DL) as raw material, Schiff base nitrogen-containing lignin(N-DL) was prepared by phase transfer ultrasonic method, and then further reacted with 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide(DOPO) to synthesize nitrogen-phosphorus modified DL(NP-DL). NP-DL was a new type of expanded lignin-based nitrogen and phosphorus flame retardant. The structure and performance of NP-DL were characterized by FT-IR, 1H NMR, 31P NMR, TG, TG/FT-IR, TG/MS, GPC and XPS. The results showed that N and P were successfully introduced into the depolymerized lignin; TG analysis showed that the carbon residue rates of NP-DL at 600 and 800℃ were increased by 1 285.5% and 362.6% compared with those of DL, respectively. The test results of TG/FT-IR and TG/MS showed that NP-DL was thermally degraded to produce phosphorus: [OP+] with m/z=47, [H3PO] with m/z=50, [O2P+] with m/z=63 and[HO2P+] with m/z=64 proved that the phosphorus-containing compounds produced during the pyrolysis of NP-DL inhibited combustion.

Key words: lignin, flame retardant, DOPO, Schiff base reaction

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