Study on Synergistic Effect of Modified Antimony Trioxide and Aluminum Diethylhypophosphite on Flame⁃retardant PA6

doi:10.19491/j.issn.1001-9278.2020.11.006

Abstract

Abstract:

Antimony trioxide （Sb₂O₃） was modified with a silane coupling agent （KH560）， and then the synergistic flame retarding effect of Sb₂O₃ and aluminum diethylphosphate （ADP） on polyamide 6 （PA6） was investigated. The chemical structure and thermal performance of modified Sb₂O₃ was characterized by Fourier-transform infrared spectroscopy and thermogravimetric analysis （TG）. The flame-retardant performance and relevant mechanism of PA6-based composites were analyzed by vertical burning test， limiting oxygen index， and cone calorimeter analysis， TGA， SEM and Raman spectroscopy. The results indicated that the modified Sb₂O₃ exhibited a better synergistic flame-retardant effect than pristine Sb₂O₃. The flame-retardant PA6 composites achieved a UL 94 V-0 classification and a LOI of 33.8 vol% at a modified Sb₂O₃ content of 2 wt% and a ADP content of 8 wt%.

Key words: polyamide 6, aluminum diethylhypophosphite, antimony trioxide, synergistic effect

CLC Number:

TQ323.6

LIU Yan, LU Zhehong, KANG Xinlong, FENG Weili, LIU Baoying, LI Jiantong, DING Tao, XU Yuanqing, FANG Xiaomin. Study on Synergistic Effect of Modified Antimony Trioxide and Aluminum Diethylhypophosphite on Flame⁃retardant PA6[J]. China Plastics, 2020, 34(11): 29-35.

Figures/Tables 11

References 17

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样品编号	PA6 含量	ADP 含量	Sb₂O₃ 含量	改性Sb₂O₃ 含量	聚四氟乙烯含量
S1	99.7	0	0	0	0.3
S2	91.7	8	0	0	0.3
S3	90.7	8	1	0	0.3
S4	89.7	8	2	0	0.3
S5	90.7	8	0	1	0.3
S6	89.7	8	0	2	0.3

样品编号	PA6 含量	ADP 含量	Sb₂O₃ 含量	改性Sb₂O₃ 含量	聚四氟乙烯含量
S1	99.7	0	0	0	0.3
S2	91.7	8	0	0	0.3
S3	90.7	8	1	0	0.3
S4	89.7	8	2	0	0.3
S5	90.7	8	0	1	0.3
S6	89.7	8	0	2	0.3

样品	极限氧指数/%	UL 94级别	有无熔滴
S1	25.7	无级别	有
S2	29.5	V?2	有
S3	30.8	V?2	有
S4	33.0	V?2	有
S5	30.8	V?2	有
S6	33.8	V?0	无

样品	极限氧指数/%	UL 94级别	有无熔滴
S1	25.7	无级别	有
S2	29.5	V?2	有
S3	30.8	V?2	有
S4	33.0	V?2	有
S5	30.8	V?2	有
S6	33.8	V?0	无

样品	空气气氛			氮气气氛
样品	T_{5 %}/℃	T_max/℃	800 ℃残炭率/%	T_{5 %}/℃	T_max/℃	800 ℃残炭率/%
S1	364.4	445.4	2.71	369.8	437.7	0.12
S2	360.4	429.5	6.00	365.2	452.7	2.23
S4	365.0	432.4	6.92	315.3	421.7	3.23
S6	364.4	428.9	7.54	344.8	429.2	4.13