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Preparation and Properties of Self-healing Lignin-based Flame Retardant Polyurethane Elastomers Based on Coordination Reaction
Received:May 07, 2024  
DOI：10.11980/j.issn.0254-508X.2024.07.012
Key Words:polyurethane prepolymer  lignin  self-healing  flame retardant  metal coordination
Fund Project:广西清洁化制浆造纸与污染控制重点实验室开放基金资助项目（2021KF30）。
Author NameAffiliationPostcode
YUE Xiaopeng College of Light Industry Science and Engineering， Shaanxi University of Science & Technology， Xi’an， Shaanxi Province， 710021
College of Light Industry and Food Engineering， Guangxi Key Lab of Clean Pulp & Papermaking and Pollution Control， Guangxi University， Nanning， Guangxi Zhuang Autonomous Region， 530004 		530004
GUAN Lixiang College of Light Industry Science and Engineering， Shaanxi University of Science & Technology， Xi’an， Shaanxi Province， 710021 710021
ZHANG Siqian College of Light Industry Science and Engineering， Shaanxi University of Science & Technology， Xi’an， Shaanxi Province， 710021 710021
CAO Panpan College of Light Industry Science and Engineering， Shaanxi University of Science & Technology， Xi’an， Shaanxi Province， 710021 710021
WANG Zhiwei* College of Light Industry and Food Engineering， Guangxi Key Lab of Clean Pulp & Papermaking and Pollution Control， Guangxi University， Nanning， Guangxi Zhuang Autonomous Region， 530004 530004
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Abstract:By controlling the ratio of star structure lignin （L-TA） sealed with triazole group and polyurethane prepolymer （P-TA）， lignin-based self-healing elastomers were prepared under the coordination reactions with different metal ions， and the flame retardant properties of the elastomers were improved by adding flame retardant DT containing triazole group. The tensile strength of 70P-TA/20L-TA/10DT with DT instead of 10% L-TA was 88.4% higher than that of pure P-TA under the coordination reaction with Fe3+， and the LOI value of the sample 70P-TA/20L-TA/10DT reached 29.5%， and the UL-94 reached V-0 level. However， the addition of L-TA and DT further increased the steric hindrance inside the sample and decreased the molecular chain mobility， so that the self-healing efficiency of 70P-TA/20L-TA/10DT decreased to 81.3% from 91.1% of 100P-TA. In addition， compared with other metal ions， the lower coordination bond strength of Zn2+—N decreased the glass transition temperature （Tg） of the elastomer 70P-TA/20L-TA/10DT：Zn2+， which improved the fluidity of the polymer chain and entitled it a higher self-healing efficiency （87.7%）.
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