Structure and Properties of SSBR/BR/Surface-modified SiO2 Green Tire Tread Stock †

doi:10.7503/cjcu20190378

Abstract

Abstract:

SiO₂ is deemed as one of the most important reinforcing materials in tread stocks of green tires. The surface modification of SiO₂ and interactions between hydrophilic SiO₂ and hydrophobic rubbers are closely related to the properties of rubber vulcanizates. In this work, four kinds of SiO₂ modified with different functional groups were incorporated into the solution polymerized styrene butadiene rubber/butadiane rubber(SSBR/BR) stocks, and the structures and properties of the SSBR/BR/SiO₂ rubber nanocomposites were systematically studied. Compared with the compound filled with unmodified SiO₂, the Mooney viscosity and bound rubberof the SSBR/BR/SiO₂ compounds filled with modified SiO₂ increased significantly indicating the greatly enhanced filler-rubber interaction. The scorch time and the optimum curing time of the SSBR/BR/SiO₂ compounds filled with modified SiO₂ reduced by 60% and 35%—40%, respectively. The SSBR/BR vulcanizates filled with modified SiO₂ exhibited higher cross-linking density, remarkably improved filler dispersion and excellent mechanical properties including the modulusat 100% and 300% increased by 50%—63% and 48%—57%, the wear resistance improved by 5%—12%, and heat built-up decreased by 7%—13%, the hot air aging properties increased by 4%—22%, and tanδ at 60 ℃ indicating rolling resistance decreased by 8%—13%. In addition, the wet-skid resistance of SSBR/BR/HB 2105N vulcanizate filled with 90 mmol/kg amino-modified SiO₂ was 6.9% higher than that of SSBR/BR/1165MP vulcanizate filled with unmodified SiO₂. Surface modification of SiO₂ could significantly improve the filler-rubber interaction and filler dispersion in the rubber matrix, and therefore contribute to the excellent comprehensive properties of the composites.

Key words: SiO₂, Surface-modified, Tire tread stock, Solution polymerized Styrene butadiene rubber/Butadiene rubber, Physical-mechanical propery

CLC Number:

O631

TrendMD:

CAI Lei,ZHAO Yuanjin,ZHANG Xingping,HE Aihua,DING Tao,LI Xiaohong,ZHANG Zhijun. Structure and Properties of SSBR/BR/Surface-modified SiO₂ Green Tire Tread Stock ^†[J]. Chem. J. Chinese Universities, 2019, 40(11): 2388.

Figures/Tables 10

References 44

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SiO₂Brand	1165MP	HB 2105N	HB 2205N	HB 2200D
Functional group in the modifier	None	Amino	Amino	Double bond
Contents of modifier/(mmol·kg^-1)	0	90	140	260
Apparent density/(g·mL^-1)	0.88	0.28	0.13	0.16
Mass loss at 950 ℃(%)	4.50	7.52	8.17	5.61
Oil absorption/(mL·100 g^-1)	160	168	196	207
Specific surface area(BET)/(m²·g^-1)	155	151	125	121

SiO₂Brand	1165MP	HB 2105N	HB 2205N	HB 2200D
Functional group in the modifier	None	Amino	Amino	Double bond
Contents of modifier/(mmol·kg^-1)	0	90	140	260
Apparent density/(g·mL^-1)	0.88	0.28	0.13	0.16
Mass loss at 950 ℃(%)	4.50	7.52	8.17	5.61
Oil absorption/(mL·100 g^-1)	160	168	196	207
Specific surface area(BET)/(m²·g^-1)	155	151	125	121

System	S/B-1165MP	S/B-HB 2105N	S/B-HB 2205N	S/B-HB 2200D
Mooney viscosity	72	79	74	80
Boundrubber(%)	16	23	20	22
Green strength/MPa	0.41	0.40	0.39	0.41
Modulus at 100%/MPa	0.40	0.39	0.36	0.41
Modulus at 300%/MPa	0.36	0.37	0.35	0.32
Elongation at break(%)	935	1119	662	695
Shore A hardness/(°)	32	32	33	31

System	S/B-1165MP	S/B-HB 2105N	S/B-HB 2205N	S/B-HB 2200D
Mooney viscosity	72	79	74	80
Boundrubber(%)	16	23	20	22
Green strength/MPa	0.41	0.40	0.39	0.41
Modulus at 100%/MPa	0.40	0.39	0.36	0.41
Modulus at 300%/MPa	0.36	0.37	0.35	0.32
Elongation at break(%)	935	1119	662	695
Shore A hardness/(°)	32	32	33	31

System	S/B-1165MP	S/B-HB 2105N	S/B-HB 2205N	S/B-HB 2200D
ML/(dN·m)	2.53	2.96	2.83	3.10
MH/(dN·m)	20.2	24.7	23.7	24.4
MH-ML/(dN·m)	17.7	21.8	20.8	21.3
t_c10/min	6.24	2.40	2.48	2.40
t_c90/min	28.9	18.9	18.1	17.4
Swelling ratio, Q	1.75	1.45	1.52	1.45

Structure and Properties of SSBR/BR/Surface-modified SiO₂ Green Tire Tread Stock ^†

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Figures/Tables 10

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System	S/B-1165MP	S/B-HB 2105N	S/B-HB 2205N	S/B-HB 2200D
Tensile strength/MPa	19.9	19.5	17.7	17.6
Modulus at 100%/MPa	1.8	2.9	2.7	3.0
Modulus at 300%/MPa	7.2	11.2	10.7	11.3
Elongation at break(%)	613	487	460	438
Shore A hardness/(°)	63	72	70	72
Tear strength/(kN·m^-1)	45.3	44.2	43.3	40.7
DIN abrasion/(cm³·40 m^-1)	0.135	0.123	0.119	0.128
Rebound(%)	37.0	40.2	39.0	42.5
Heat built-up/℃	31.5	29.4	27.8	29.0
Compression set(%)	5.00	5.19	4.93	5.69
Tensile fatigue at 125%	193×10⁴	>500×10⁴	>500×10⁴	>500×10⁴
tanδ at 60 ℃	0.142	0.130	0.123	0.131
tanδ at 0 ℃	0.233	0.249	0.212	0.230
	Properties after hot air ageing(100 ℃, 72 h)
Tensile strength/MPa	18.0	18.1	17.1	17.4
Modulus at 100%/MPa	3.1	4.4	4.1	4.6
Modulus at 300%/MPa	13.3	17.4	15.5	17.1
Elongation at break(%)	386	311	330	304
Swelling ratio, Q	1.66	1.41	1.35	1.36
Ageing coefficient(%)	56.9	69.3	68.7	59.3

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System	S/B-1165MP	S/B-HB 2105N	S/B-HB 2205N	S/B-HB 2200D
Dispersion(%)	99.3	99.7	99.8	99.7
White area(%)	1.0	0.1	0.1	0.2

System	S/B-1165MP	S/B-HB 2105N	S/B-HB 2205N	S/B-HB 2200D
Dispersion(%)	99.3	99.7	99.8	99.7
White area(%)	1.0	0.1	0.1	0.2