TBIR应用于航空胎侧胶的热氧老化性能

doi:10.7503/cjcu20190540

摘要/Abstract

摘要：

研究了反式-1,4-丁二烯-异戊二烯共聚橡胶(TBIR)应用于航空轮胎胎侧胶[天然橡胶(NR)/顺丁橡胶(BR)/TBIR]的耐热氧老化性能. 结果表明, 与NR/BR硫化胶相比, 10~20份质量的TBIR取代BR后, NR/BR/TBIR硫化胶的交联密度明显提高, 压缩温升降低2.2~3.4 ℃, 耐屈挠疲劳性能提高约100%, 填料分散性改善, 填料团聚体体尺寸减小, 拉伸性能基本不变. 随热氧老化时间延长, 硫化胶的交联密度先增加后降低, 并用TBIR的硫化胶交联密度在老化48 h后趋于平缓. 与NR/BR相比, 老化后的NR/BR/TBIR硫化胶生热最低, 耐屈挠疲劳性最高.

关键词: 天然橡胶, 顺丁橡胶, 反式-1, 4-丁二烯-异戊二烯共聚橡胶, 热氧老化, 胎侧胶

Abstract:

The thermal-oxidative aging performance of a new generation synthetic rubber trans-1,4-butadiene-isoprene copolymer rubber(TBIR) in NR/BR vulcanizates was studied. Compared with the NR/BR vulcanizates, the crosslinking density of NR/BR/TBIR vulcanizates with 10 to 20 per hundreds of rubber(phr) TBIR improved significantly as while as the tensile properties changed little. The heat build-up reduced by 2.2—3.4 ℃ and the flexural fatigue resis-tance increased about 100%. The filler dispersion improved and the average aggregate size of the filler reduced. With the increasing of thermal-oxidative aging time, the crosslinking density of vulcanizates increased and then decreased. The crosslinking density of NR/BR/TBIR vulcanizates remained unchanged after 48 h. With the increasing of aging time, the heat build-up first decreased and then increased and NR/BR/TBIR vulcanizates has the lowest heat build-up value. The flexural fatigue lifetime of NR/BR/TBIR was better than NR/BR vulcanizates.

Key words: Natural rubber, Butadiene rubber, trans-1, 4-Butadiene-isoprene copolymer rubber, Thermal-oxidative aging, Sidewall

中图分类号:

O631

TrendMD:

国钦瑞, 邵华锋, 贺爱华. TBIR应用于航空胎侧胶的热氧老化性能. 高等学校化学学报, 2020, 41(4): 789.

GUO Qinrui, SHAO Huafeng, HE Aihua. Thermal-oxidative Aging Performance of TBIR Modified NR/BR Vulcanizates in Aircraft Tire Sidewall ^†. Chem. J. Chinese Universities, 2020, 41(4): 789.

图/表 8

Fig.1 Stress-strain curves(A) and DSC curves(B) of NR/BR/TBIR compoundsm(NR)/m(BR)/m(TBIR): a. 80∶20∶0; b. 80∶10∶10; c. 80∶0∶20. Inset of(A): partially enlarged stress-strain curves.

Table 1 Cure characteristic data of NR/BR/TBIR compounds

m(NR)/m(BR)/m(TBIR)	M_L/(dN·m^-1)	M_H/(dN·m^-1)	M_H-M_L/(dN·m^-1)	t₁₀/min	t₉₀/min	v_r/min^-1
80∶20∶0	2.35	22.65	20.30	15.45	47.40	3.12
80∶10∶10	2.39	23.55	21.16	15.19	60.99	2.18
80∶0∶20	2.73	25.83	23.10	14.58	70.72	1.78

Fig.2 Cure characteristic curves of NR/BR/TBIR compoundsm(NR)/m(BR)/m(TBIR): a. 80∶20∶0; b. 80∶10∶10; c. 80∶0∶20.

Fig.3 Swelling index of NR/BR/TBIR vulcanized rubber with different aging timem(NR)/m(BR)/m(TBIR): a. 80∶20∶0; b. 80∶10∶10; c. 80∶0∶20.

Fig.4 Mean aggregate size and filler dispersion of NR/BR/TBIR vulcanizates with different aging time

Fig.5 The 1st(A) and 6th(B) class flexural fatigue lifetime of NR/BR/TBIR vulcanizates with different aging time

Table 2 Mechanical properties of the NR/BR/TBIR vulcanizates with different aging time

Sample	NR/BR/TBIR(80∶20∶0)				NR/BR/TBIR(80∶10∶10)				NR/BR/TBIR(80∶0∶20)
Aging time/h	0	24	48	72	0	24	48	72	0	24	48	72
Tensile strength/MPa	21.6	23.3	19.2	19.9	22.6	21.9	21.2	19.6	21.9	22.7	20.3	18.8
Modulus at 100%/MPa	2.63	3.83	4.72	5.14	2.36	3.37	4.72	4.69	3.37	4.51	5.49	5.89
Modulus at 300%/MPa	12.2	15.6	17.0	18.5	11.0	13.4	17.5		14.3	16.8	18.8	17.2
Elongation at break(%)	491	518	350	324	553	487	372	294	468	427	330	334
Rebound(%)	47.7	50.3	48.6	48.3	46.2	48.8	48.7	47.2	46.1	48.3	48.2	47.3
Shore A hardness/(°)	71	75	77	77	73	75	77	78	73	76	77	80

Fig.6 Heat build-up of NR/BR/TBIR vulcanizates with different aging time

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