摘要
为了探究140℃条件下不同热氧老化时间对红磷(RP)/长玻纤增强聚丙烯(LGFPP)阻燃体系的阻燃性能、燃烧性能以及残炭形貌的影响。并采用极限氧指数值测试(LOI)、垂直燃烧测试(UL-94)、锥形量热仪(CONE)等对热氧老化后RP/LGFPP阻燃体系结构与性能的影响进行了测试表征。结果表明:伴随热氧老化时间的增加,RP/LGFPP阻燃体系的LOI表现为先增大后减小变化规律,阻燃等级均保持为V-0级;试样的引燃时间(TTI)逐渐增加,热释放速率峰值(PHRR)及其平均值(MHRR)、总热释放速率(THR)值匀呈现不断下降的趋势。通过对锥形量热仪燃烧测试残留炭层的宏观形貌图分析,结果表明:未老化试样燃烧后形成黑色致密而均匀的残留炭层,试样燃烧后生成的炭层颜色随着经过热氧老化的延长逐渐变浅,且炭层表现为不致密和较多裂纹。
The flame-retardant, flammability and carbon residues of the flame retardant long-glass-fiber reinforced polypropylene composite （RP/LGFPP） with different thermal-oxidative exposure times at 140℃ were studied. The influences of RP/LGFPP samples under heat and oxygen were characterized by means of the limiting oxygen index （LOI） , vertical burning test （UL-94） , scanning electronic microscopy （SEM） tests. The results indicated that the LOI first increased and then decreased with the aging time prolonged,and the V-0 rating remained constant. The TTI of RP/LGFPP increased and the peak of heat release rate, mean heat release rate and total heat release rate of RP/LGFPP all gradually decreased. The combustion residue of cone calorimeter test declared that dense and well-distributed black residue formed after combustion of unaged samples,the color of the carbon layer formed from the combustion of the sample faded gradually,the carbon layer was not densed and numerous sharp microcracks appeared with the extension of the aging time.
出处
《塑料》
CAS
CSCD
北大核心
2015年第6期29-31,34,共4页
Plastics
基金
贵州省科技计划黔科合计省合(2014)7008
贵州省科技计划黔科合重大专项字[20116023]
贵阳市技术创新201408
关键词
长玻纤增强聚丙烯
红磷
热氧老化
阻燃性能
燃烧性能
残炭形貌
long-glass-fiber reinforced polypropylene
RP
thermal-oxidative aging
flame retardancy
flammability
carbon residues
