摘要
通过极限氧指数测定、垂直燃烧实验和锥形量热分析研究了苯氧基磷腈的组成对其阻燃PC/ABS的影响,并通过锥形量热实验的残炭分析研究了其作用机理。结果表明,苯氧基磷腈的组成对其阻燃PC/ABS有较大影响。随苯氧基磷腈中六苯氧基环三磷腈(HPTCP)含量的降低,其阻燃作用明显降低。残炭分析结果表明,苯氧基磷腈在燃烧过程中分解成磷酸、聚磷酸和偏磷酸等磷酸化合物,这些物质可有效地促进PC/ABS成炭,并形成膨胀性炭层,因而产生阻燃作用。苯氧基磷腈中x(HPTCP)降低,燃烧时形成的磷酸化合物较少,因而降低了其成炭和阻燃作用。
The influence of the composition of phenoxyphosphazene on its flame retardancy in PC/ABS was studied by limiting oxygen index（LOI）measurement,vertical burning test and cone calorimeter test（CCT）,and its mechanism was also investigated by the analysis of the residues obtained in CCT.The results revealed that the composition of phenoxyphosphazene has a greater impact on its flame retardancy in PC/ABS.With the decrease of the content of hexaphenoxycyclotriphosphazene（HPTCP）in phenoxyphosphazene,its flame retardancy become poor obviously.The analysis of the residues revealed that phenoxyphosphazene plays a flame retardancy mainly by condensed phase mechanism.In the process of combustion,phenoxyphosphazenes were decomposed into non-volatile phosphoric acid compounds,which promoted charring of E-44/DG731,and the char was changed into the intumescent layer by the foaming of CO2,NH3 and N2released from the decomposition of the composite.The above processes resulted in good condensed phase flame retardancy.With the decrease of the content of HPTCP in phenoxyphosphazene,phosphoric acid compounds formed in the process of combustion were reduced,which make its carbonization and flame retardancy poor.
出处
《化工科技》
CAS
2016年第1期1-6,共6页
Science & Technology in Chemical Industry
基金
国家自然科学基金项目(21276131)
