Study on Warpage of Flame⁃retardant PA66 Composites

doi:10.19491/j.issn.1001-9278.2021.01.004

Abstract

Abstract:

The warpage of brominated flame-retardant PA66 composites was investigated in terms of the compositions without glass fiber and with the circular and flat glass fibers. The warpage of the composites was analyzed on the basis of their mechanical properties， crystallization properties， shrinkage rate and transverse/longitudinal shrinkage ratio. The results indicated that the composites without glass fiber had the highest crystallinity， transverse shrinkage and longitudinal shrinkage， but the lowest transverse/longitudinal shrinkage ratio and warpage. At the same content of glass fibers， the warpage of the composites with the flat glass fiber was obviously better than that of the composite with the circular glass fiber due to a lower ratio of transverse/longitudinal shrinkage. In the case of mechanical properties， the tensile strength and bending strength of the composites with flat glass fibers were lower than that of the composites with the circular glass fiber. The different types of glass fibers had little effect on the crystallization of the composites， and their crystallinity and crystallization peak temperature were very close to each other. At the same content of flame retardant， both the transverse shrinkage and the longitudinal shrinkage of the composites decreased with an increase in the content of the flat glass fiber. However， their transverse/longitudinal shrinkage ratio increased， leading to an increase in the warpage of the composites.

Key words: warpage, bromine flame retardant, circular glass fiber, flat glass fiber, polyamide 66, shrinkage

CLC Number:

TQ 323.6

YI Xin, ZHANG Yong, WU Changbo, ZHOU Hualong, XU Hongji, DING Chao. Study on Warpage of Flame⁃retardant PA66 Composites[J]. China Plastics, 2021, 35(1): 19-24.

Figures/Tables 8

References 11

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样品编号	PA66 EPR24/%	BPS 7010/%	S?12N/%	ECS301HP?3?H/%	ECS301HP?3?M3/%	助剂/%
A?0	69.5	23	7	-	-	0.5
A?5	64.5	23	7	-	5	0.5
A?10	59.5	23	7	-	10	0.5
A?20	49.5	23	7	-	20	0.5
A?30	39.5	23	7	-	30	0.5
A?40	29.5	23	7	-	40	0.5
B?30	39.5	23	7	30	-	0.5

样品编号	PA66 EPR24/%	BPS 7010/%	S?12N/%	ECS301HP?3?H/%	ECS301HP?3?M3/%	助剂/%
A?0	69.5	23	7	-	-	0.5
A?5	64.5	23	7	-	5	0.5
A?10	59.5	23	7	-	10	0.5
A?20	49.5	23	7	-	20	0.5
A?30	39.5	23	7	-	30	0.5
A?40	29.5	23	7	-	40	0.5
B?30	39.5	23	7	30	-	0.5

样品	拉伸强度/ MPa	弯曲强度/ MPa	弯曲模量/ MPa	悬臂梁缺口冲击/kJ?m^-2	阻燃等级
数据偏差	±5	±5	±300	±1	-
A?0	73	116	2 990	4.4	V?1
A?5	88	142	4 070	4.2	V?1
A?10	102	154	5 060	4.8	V?1
A?20	138	200	7 650	8.9	V0
A?30	154	225	10 900	12.0	V0
A?40	159	232	14 000	13.0	V0
B?30	167	247	10 400	12.0	V0

样品	拉伸强度/ MPa	弯曲强度/ MPa	弯曲模量/ MPa	悬臂梁缺口冲击/kJ?m^-2	阻燃等级
数据偏差	±5	±5	±300	±1	-
A?0	73	116	2 990	4.4	V?1
A?5	88	142	4 070	4.2	V?1
A?10	102	154	5 060	4.8	V?1
A?20	138	200	7 650	8.9	V0
A?30	154	225	10 900	12.0	V0
A?40	159	232	14 000	13.0	V0
B?30	167	247	10 400	12.0	V0

样品编号	w/%	T_mp/℃	ΔH_m/ J?g^-1	X_c/%	T_cp/℃	T_co/℃	T_ce/℃
A?0	69.5	261.0	44.82	34.3	237.5	229.8	243.8
A?10	59.5	260.8	33.39	29.85	237.5	229.8	243.6
A?30	39.5	260.4	21.99	29.62	237.2	229.5	243.5
A?40	29.5	259.6	15.13	27.28	235.2	227.5	241.7
B?30	39.5	259.8	22.14	29.82	237.3	229.7	243.5