摘要
采用密胺包覆聚磷酸铵(APP)、季戊四醇(PER)和三聚氰胺(MEL)作为膨胀型阻燃剂(IFR)对不饱和树脂(UP)进行改性,研究了APP、PER和MEL不同复配比例及用量对不饱和树脂基复合材料阻燃性能和力学性能的影响。基于IFR最佳用量,以二乙基次磷酸铝(ADP)为协效剂,研究了ADP用量对IFR/UP阻燃复合材料阻燃性能、力学性能及热稳定性的影响。结果表明,当APP∶PER∶MEL复配比例为4∶1∶1,IFR添加量为15%(质量分数,下同)时,复合材料综合性能最佳,其极限氧指数为27.4%,UL 94垂直燃烧达到V-1等级,弯曲强度和冲击韧性分别为100.3 MPa和6.3 kJ/m^(2);ADP的引入能够进一步提高IFR/UP复合材料阻燃性能,且随着ADP质量分数的增加而增强;当ADP质量分数为2%时,IFR-ADP/UP复合材料极限氧指数为28.5%并达到V-0阻燃等级,弯曲强度和冲击韧性分别为110 MPa和7.8 kJ/m^(2),与IFR/UP复合材料相比,分别提高了9.7%和23.8%;ADP能够促进IFR/UP复合材料表面成炭,缓解基体的热降解。
Unsaturated polyester(UP)resin composites were modified with an intumescent flame-retardant(IFR)system based on the mela mine-coated a mmonium polyphosphate(APP),pentaerythritol(PER),and mela mine(MEL),and the effect of APP/PER/MEL mass ratio and total amount on the flame retardant and mechanical properties of the UP/IFR composites were investigated.According to the optimal mass ratio of IFR,alu minum diethyl phosphate(ADP)was then added into the UP/IFR composites as a flame-retardant synergistic agent,and the flame retardant properties,mechanical properties,and thermal stability of UP/IFR-ADP composites with different content of ADP were evaluated.The results indicated that the composites achieved a UL 94 V-0 classification in the vertical burning test at a APP/PER/MEL mass ratio of 4∶1∶1,a IFR content of 15 wt%,and a limiting oxygen index(LOI)of 27.4 vol%,and their flexural strength and impact toughness were 100.3 MPa and 6.3 kJ/m^(2),respectively.The introduction of ADP further improved the flame retardancy of IFR/UP composites,and the flame-retarding effect was enhanced with an increase in the mass fraction of ADP.When the mass fraction of ADP was 2 wt%,the UP/IFR-ADP composites obtained an LOI of 28.5 vol%,a UL-94 V-0 classification,flexural strength of 110 MPa,and impact toughness of 7.8 kJ/m^(2).Compared to the UP/IFR composite containing 15 wt%of IFR,the UP/IFR-ADP composites achieved an increase in flexural strength by 9.7%and in impact toughness increased by 23.8%.TG analysis results indicated that ADP could promote the formation of amorphous char layer and slow down the thermal degradation of the matrix.
作者
李金凤
梁卓恩
彭新龙
LI Jinfeng;LIANG Zhuoen;PENG Xinlong(Sales Department,Zhaoqing Futian Chemical Co,Ltd,Zhaoqing 526238,China;R&D Department,Guangdong Brand Builder New Materials Co,Ltd,Zhaoqing 526238,China)
出处
《中国塑料》
CAS
CSCD
北大核心
2022年第6期116-123,共8页
China Plastics
关键词
不饱和树脂
阻燃性能
二乙基次磷酸铝
unsaturated polyester resin
flame retardancy
aluminum diethyl phosphate
