Study on the Rheological Properties during the Thermal Oxidative Aging of Brominated Butyl Rubber Based on Rubber Processing Analyzer

doi:10.12422/j.issn.1006-396X.2023.01.004

Abstract

Abstract:

This paper used a rubber processing analyzer (RPA) to study the effect of different amounts of epoxidized soybean oil and antioxidants on the rheological properties of brominated butyl rubber (BIIR) during the thermal oxidative aging process and discussed the cause of degradation and gel generation of BIIR.The results show that the rheological properties change trend is consistent with the GPC data,which proves that the thermal oxidative aging of BIIR is a process involving both molecular cross?linking and degradation;epoxidized soybean oil and antioxidants can greatly slow down the rate of the gel generation and molecular chain degradation during the aging process of BIIR.Different antioxidants have different anti?aging effects on BIIR.Antioxidant 1076 has a stronger inhibitory effect on oxidative degradation of BIIR than antioxidant 264.

Key words: Brominated butyl rubber, Rubber processing analyzer, Rheological properties, Thermal oxygen aging properties

摘要：

采用橡胶加工分析仪（RPA）研究了不同质量分数的环氧大豆油、抗氧剂对溴化丁基橡胶（BIIR）热氧老化过程中流变性能的影响规律，并探讨了BIIR降解与凝胶产生的原因。结果表明，流变性能变化趋势与GPC数据一致，证明BIIR的热氧老化过程是一个分子交联与降解并存的过程；环氧大豆油、抗氧剂对BIIR老化过程中凝胶的生成与分子链的降解均有明显的延缓作用；不同的抗氧剂对其产生的效果具有明显差异，抗氧剂1076对BIIR氧化降解的抑制作用强于抗氧剂264。

关键词: 溴化丁基橡胶, 橡胶加工分析仪, 流变性能, 热氧老化性能

CLC Number:

TQ333.6

Fulan Hao, Kun Cao, Xiaojuan Mu, Defang Zhou, Qingping Mu, Xuebin Ren, Zhenxue Liu. Study on the Rheological Properties during the Thermal Oxidative Aging of Brominated Butyl Rubber Based on Rubber Processing Analyzer[J]. Journal of Petrochemical Universities, 2023, 36(1): 25-31.

郝福兰, 曹堃, 牟晓娟, 周德芳, 牟庆平, 任学斌, 刘振学. 基于RPA的BIIR热氧老化过程中流变性能研究[J]. 石油化工高等学校学报, 2023, 36(1): 25-31.

Figures/Tables 9

Table 1 Influence of thermal oxygen aging on molecular weight and distribution of BIIR

老化温度/℃	老化时间/h	M_w×10^-4/（g $⋅$ mol^-1）	M_n×10^-4/（g $⋅$ mol^-1）	M_w/M_n
140	0	57.6	16.3	3.53
140	2	59.2	15.2	3.91
140	4	64.5	13.2	4.89
140	6	80.8	11.5	7.05
140	8	-	-	-

Table 1 Influence of thermal oxygen aging on molecular weight and distribution of BIIR

老化温度/℃	老化时间/h	M_w×10^-4/（g $⋅$ mol^-1）	M_n×10^-4/（g $⋅$ mol^-1）	M_w/M_n
140	0	57.6	16.3	3.53
140	2	59.2	15.2	3.91
140	4	64.5	13.2	4.89
140	6	80.8	11.5	7.05
140	8	-	-	-

Fig.1 The rheological properties curve of BIIR with thermal oxygen aging process

Fig.2 Effects of mass fraction of ESBO on BIIR rheological properties after thermal oxygen aging

Fig.3 Effects of mass fraction of Antioxidant 1010 on BIIR rheological properties after thermal oxygen aging

Fig.4 Effects of mass fraction of antioxidant 1076 on rheological properties of BIIR after thermal oxygen aging

Fig.5 Effects of mass fraction of antioxidant 264 on rheological properties of BIIR after thermal oxygen aging

Fig.6 Effects of aging time of antioxidant 1076 on rheological properties of BIIR during thermal oxygen aging process

Fig.7 Effects of aging time of antioxidant 264 on rheological properties of BIIR during thermal oxygen aging process

Fig.8 Effects of antioxidant 1076 and 264 on G' and G" intersection point value of BIIR during thermal oxygen aging process

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