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摘要
以可膨胀石墨(EG)为阻燃剂,液体硅胶为基体,通过硅氢加成反应制备EG阻燃多孔硅胶,研究了EG对材料氧指数、烟密度、点火时间、熄灭时间、热释放量、热性能的影响。结果表明:EG添加量为5%(wt,质量分数,下同)时,阻燃多孔硅胶氧指数可达到38.4%,与纯多孔硅胶氧指数相比提高47.7%;EG的加入不利于烟密度的降低;适当添加EG,可延迟点火时间,降低阻燃多孔硅胶的总热释放量;EG添加量为15%时,阻燃多孔硅胶总热释放量降低56.67%。热失重分析表明,EG的加入可明显延迟阻燃多孔硅胶支链和主链的分解温度,EG添加量为15%时,阻燃多孔硅胶支链和主链分解分度分别升高21℃和44℃。
Abstract
Expandable graphite(EG) was used as a flame retardant and liquid silicone rubber as a matrix to prepare an EG flame-retardant porous silicone rubber material by hydrosilylation.The oxygen index of the porous silicone rubber was tested,and when EG of 5% was added,it was 38.4%,compared with pure porous silicone rubber,it increased by 47.7%.Smoke density test shown that the addition of EG was not conducive to the reduction of smoke density.Cone calorimetry result shown that the appropriate addition of EG can delay the ignition time and reduced the total heat release of porous silicone rubber.When 15% was added,the total heat release was reduced by 56.67%.TG analysis showed that the addition of EG significantly delayed the decomposition temperature of the branched and main chains of the porous silicone rubber.When 15% was added,the branching and main chain decomposition fractions were delayed by 21℃ and 44℃,respectively.
关键词
可膨胀石墨
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阻燃
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多孔硅胶
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氧指数
Key words
expandable graphite
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flame retardant
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porous silicone rubber
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oxygen index
可膨胀石墨阻燃多孔硅胶的制备与表征[J].
化工新型材料, 2020, 48(8): 185-189 DOI:10.19817/j.cnki.issn 1006-3536.2020.08.041
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基金资助
国家自然科学基金(5177041548)
