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首页> 外文期刊>Journal of Polymer Research >Functionalized lignin for halogen-free flame retardant rigid polyurethane foam: Preparation, thermal stability, fire performance and mechanical properties
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Functionalized lignin for halogen-free flame retardant rigid polyurethane foam: Preparation, thermal stability, fire performance and mechanical properties

机译：用于无卤阻燃硬质聚氨酯泡沫的功能化木质素：制备，热稳定性，防火性能和机械性能

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摘要

Halogen-free flame retardant rigid polyurethane foams (RPUF) were synthesized by substituting a part of polyther polyol with polyol-modified lignin and filled with phenolic encapsulated ammonium polyphosphate (PFAPP). Lignin was chemically modified with flame retardant elements, phosphorous, via a three-step reaction. The foams maintained a regular cell structure and had even smaller average cell size than pure foam. The effects of lignin polyol and PFAPP on the apparent density, compressive strength were discussed. The thermal stability, flame retardant properties and mechanical properties of the foams are improved. Compared with pure foam (0.2 % char residue at 700°C), modified foam with lignin and PFAPP exhibits much higher char formation (42.7 % char residue at 700°C). The FR properties of these modified foams were evaluated by cone calorimeter and limiting oxygen index (LOI). The modified lignin in foam system further reduces the heat release rate and shows the combustion process. The addition of 15 % PFAPP and 10 % modified lignin into RPUF led to a considerable increase of the compressive strength with respect to the neat RPUF.
机译：通过用一部分多元醇改性的木质素代替聚醚多元醇并填充酚醛封装的聚磷酸铵（PFAPP），合成了无卤阻燃硬质聚氨酯泡沫（RPUF）。木质素通过三步反应用磷的阻燃元素化学修饰。泡沫保持规则的孔结构，并且具有比纯泡沫还要小的平均孔尺寸。讨论了木质素多元醇和PFAPP对表观密度，抗压强度的影响。泡沫的热稳定性，阻燃性能和机械性能得到改善。与纯泡沫（在700°C下残留0.2％的炭残留物）相比，具有木质素和PFAPP的改性泡沫表现出更高的焦炭形成（在700°C时残留42.7％的焦炭）。通过锥形量热仪和极限氧指数（LOI）评估了这些改性泡沫的阻燃性能。泡沫系统中改性的木质素进一步降低了放热速率并显示出燃烧过程。相对于纯净的RPUF，在RPUF中添加15％的PFAPP和10％的改性木质素导致抗压强度的显着提高。

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