Preparation and properties of XNBR/PA12 thermoplastic elastomer

doi:10.19491/j.issn.1001-9278.2022.03.003

Abstract

Abstract:

The effects of carboxylation rate and mass ratio of rubber to plastic on the mechanical properties， rheological properties， oil resistance， and hot air aging properties of dynamically vulcanized carboxylated nitrile rubber （XNBR）/polyamide 12 （PA12） thermoplastic vulcanizate （TPV） were investigated. The results indicated that the TPV exhibited tensile strength of 20.3 MPa and elongation at break of 184 % when the carboxyl group content of XNBR had 7 wt% and the mass ratio of rubber to plastic was 50/50， presenting optimal comprehensive mechanical properties. Its mechanical properties increased at first and then tended to decrease with an increase in the mass ratio of rubber to plastic. Rheological results indicated that the complex viscosity and storage modulus of the TPV increased with an increase in the mass ratio of rubber to plastic. The oil resistance and air aging resistance of the TPV decreased with an increase in the mass ratio of rubber to plastic and reached optimal values at the mass ratio of 40 to 60. The TPV containing a higher carboxylation rate in XNBR exhibited better aging resistance.

Key words: carboxylated nitrile rubber, polyamide 12, thermoplastic vulcanizate, mechanical property, rheological behavior, oil resistance, aging resistance

CLC Number:

TQ317.3

LI Zeyang, CEN Lan, CHEN Sheng, CHEN Weijie, DU Binghua, ZHANG Ershuai. Preparation and properties of XNBR/PA12 thermoplastic elastomer[J]. China Plastics, 2022, 36(3): 15-20.

Figures/Tables 6

References 15

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样品名称	橡塑比	XNBR含量/份		PA12/份	BIBP/份	抗氧剂1010/份
样品名称	橡塑比	NX775	X146	PA12/份	BIBP/份	抗氧剂1010/份
NX40P60	40/60	40	0	60	1.5	1
NX50P50	50/50	50	0	50	1.5	1
NX60P40	60/40	60	0	40	1.5	1
NX70P30	70/30	70	0	30	1.5	1
X40P60	40/60	0	40	60	1.5	1
X50P50	50/50	0	50	50	1.5	1
X60P40	60/40	0	60	40	1.5	1
X70P30	70/30	0	70	30	1.5	1

样品名称	橡塑比	XNBR含量/份		PA12/份	BIBP/份	抗氧剂1010/份
样品名称	橡塑比	NX775	X146	PA12/份	BIBP/份	抗氧剂1010/份
NX40P60	40/60	40	0	60	1.5	1
NX50P50	50/50	50	0	50	1.5	1
NX60P40	60/40	60	0	40	1.5	1
NX70P30	70/30	70	0	30	1.5	1
X40P60	40/60	0	40	60	1.5	1
X50P50	50/50	0	50	50	1.5	1
X60P40	60/40	0	60	40	1.5	1
X70P30	70/30	0	70	30	1.5	1

样品名称	橡塑比	硬度（A）	拉伸强度/MPa	断裂伸长率/%	撕裂强度/N·mm^-1
X40P60	40/60	98	15.6	152	74.5
X50P50	50/50	97	17.0	169	87.3
X60P40	60/40	95	14.6	158	65.3
X70P30	70/30	92	11.1	149	52.4
NX40P60	40/60	98	17.2	161	79.5
NX50P50	50/50	97	20.3	184	90.6
NX60P40	60/40	95	15.9	170	73.0
NX70P30	70/30	92	12.5	158	59.4

样品名称	橡塑比	硬度（A）	拉伸强度/MPa	断裂伸长率/%	撕裂强度/N·mm^-1
X40P60	40/60	98	15.6	152	74.5
X50P50	50/50	97	17.0	169	87.3
X60P40	60/40	95	14.6	158	65.3
X70P30	70/30	92	11.1	149	52.4
NX40P60	40/60	98	17.2	161	79.5
NX50P50	50/50	97	20.3	184	90.6
NX60P40	60/40	95	15.9	170	73.0
NX70P30	70/30	92	12.5	158	59.4

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