Structure and Properties of NBR/TBIR Composites with High Abrasion Resistance and Low Heat Built-up †

doi:10.7503/cjcu20190459

Abstract

Abstract:

The novel trans-1,4-poly(butadiene-co-isoprene) copolymer rubber(TBIR) was used to modify the acrylonitrile-butadiene rubber(NBR) for conveyor wheel with high abrasion resistant and low heat built-up. The crosslink density, physical and mechanical properties and filler dispersion of the NBR/TBIR vulcanizes filled with silica were discussed. The results show that the vulcanization rate and crosslink density of NBR/TBIR compounds increase with the increase in TBIR component when compared to the NBR compound. The NBR/TBIR(90/10, mass ratio) vulcanize shows 15% higher wear resistance, 5% lower heat built-up, 22% reduced dynamic compression set and better filler dispersion, while the other properties like aging resistance and solvent resistance kept almost unchanged. The NBR/TBIR(80/20, mass ratio) vulcanizate shows lower heat built-up, lower compression set and high filler dispersions when compared with NBR/BR(80/20) vulcanizate.

Key words: Trans-1, 4-poly(butadiene-co-isoprene) copolymer rubber, Acrylonitrile butadiene rubber, Butadiene rubber, Abrasion resistance, Nanocomposite

CLC Number:

O631

TrendMD:

WU Yingfei,LI Hongyu,CAI Lei,HE Aihua. Structure and Properties of NBR/TBIR Composites with High Abrasion Resistance and Low Heat Built-up ^†[J]. Chem. J. Chinese Universities, 2020, 41(3): 565.

Figures/Tables 9

References 31

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m(NBR)/m(TBIR)/m(BR)	100/0/0	95/5/0	90/10/0	85/15/0	80/20/0	80/0/20
M_L/(dN·m)	1.50	1.72	1.97	2.29	2.47	2.54
M_H/(dN·m)	15.81	16.17	17.70	18.52	19.96	20.88
(M_H-M_L)/(dN·m)	14.31	14.45	15.73	16.23	17.49	18.34
t₁₀/min	2.40	2.09	1.72	1.39	1.21	1.18
t₉₀/min	42.58	42.26	41.35	41.41	38.83	38.57
10⁴ Crosslink density/(mol·cm^-3)	1.601	1.714	1.802	1.837	1.878	1.692
Tensile strength/MPa	27.94	23.23	24.58	22.34	20.74	20.76
Modulus at 100%/MPa	1.96	1.96	1.98	2.07	2.03	2.43
Modulus at 300%/MPa	6.86	6.08	6.86	6.71	6.24	8.71
Elongation at break(%)	735	747	769	651	651	576
Tear strength/(kN·m^-1)	45.09	44.52	41.41	40.02	38.41	38.10
Shore A hardness/(°)	64.5	62.7	63.8	64.6	66.0	67.2
Rebound(%)	22.8	23.7	24.3	25.3	26.4	28.1

m(NBR)/m(TBIR)/m(BR)	100/0/0	95/5/0	90/10/0	85/15/0	80/20/0	80/0/20
M_L/(dN·m)	1.50	1.72	1.97	2.29	2.47	2.54
M_H/(dN·m)	15.81	16.17	17.70	18.52	19.96	20.88
(M_H-M_L)/(dN·m)	14.31	14.45	15.73	16.23	17.49	18.34
t₁₀/min	2.40	2.09	1.72	1.39	1.21	1.18
t₉₀/min	42.58	42.26	41.35	41.41	38.83	38.57
10⁴ Crosslink density/(mol·cm^-3)	1.601	1.714	1.802	1.837	1.878	1.692
Tensile strength/MPa	27.94	23.23	24.58	22.34	20.74	20.76
Modulus at 100%/MPa	1.96	1.96	1.98	2.07	2.03	2.43
Modulus at 300%/MPa	6.86	6.08	6.86	6.71	6.24	8.71
Elongation at break(%)	735	747	769	651	651	576
Tear strength/(kN·m^-1)	45.09	44.52	41.41	40.02	38.41	38.10
Shore A hardness/(°)	64.5	62.7	63.8	64.6	66.0	67.2
Rebound(%)	22.8	23.7	24.3	25.3	26.4	28.1

m(NBR)/m(TBIR)/m(BR)	100/0/0	95/5/0	90/10/0	85/15/0	80/20/0	80/0/20
Tensile strength/MPa	32.30	28.51	28.23	25.32	23.13	23.31
Modulus at 100%/MPa	3.24	3.25	2.88	3.17	3.06	3.98
Modulus at 300%/MPa	12.59	12.14	10.97	11.35	10.37	13.80
Elongation at break(%)	593	566	569	521	528	459
Ageing coefficient(%)	93	93	92	91	90	89

m(NBR)/m(TBIR)/m(BR)	100/0/0	95/5/0	90/10/0	85/15/0	80/20/0	80/0/20
Tensile strength/MPa	32.30	28.51	28.23	25.32	23.13	23.31
Modulus at 100%/MPa	3.24	3.25	2.88	3.17	3.06	3.98
Modulus at 300%/MPa	12.59	12.14	10.97	11.35	10.37	13.80
Elongation at break(%)	593	566	569	521	528	459
Ageing coefficient(%)	93	93	92	91	90	89

m(NBR)/m(TBIR)/m(BR)	100/0/0	95/5/0	90/10/0	85/15/0	80/20/0	80/0/20
Heat built-up/℃	62.2	59.7	59.2	58.3	58.2	59.0
Dynamic compression set(%)	9.8	8.9	7.6	7.9	8.5	7.9
Compression set(%)	10.7	10.4	10.9	12.0	12.3	10.6