高等学校化学学报 ›› 2024, Vol. 45 ›› Issue (4): 20230512.doi: 10.7503/cjcu20230512

• 高分子化学 • 上一篇    下一篇

白炭黑/炭黑混合填料补强仿生橡胶的性能

王珂1,2, 王玉阁2, 贺天成2, 冯雪阳1,2, 潘立佳1,2, 陈思源2, 尹园2, 孙洪国2, 郑雅芳2, 卫来1, 孙昭艳1,2()   

  1. 1.伊犁师范大学物理科学与技术学院, 新疆凝聚态相变与微结构实验室, 伊宁 835000
    2.中国科学院长春应用化学研究所高分子物理与化学国家重点实验室, 长春 130022
  • 收稿日期:2023-12-14 出版日期:2024-04-10 发布日期:2024-02-21
  • 通讯作者: 孙昭艳 E-mail:zysun@ciac.ac.cn
  • 基金资助:
    国家重点研发项目(2022YFB3707303);国家自然科学基金(52293471)

Properties of Bionic Rubber Reinforced by Silica/carbon Black

WANG Ke1,2, WANG Yuge2, HE Tiancheng2, FENG Xueyang1,2, PAN Lijia1,2, CHEN Siyuan2, YIN Yuan2, SUN Hongguo2, ZHENG Yafang2, WEI Lai1, SUN Zhaoyan1,2()   

  1. 1.Xinjiang Laboratory of Phase Transitions and Microstructures in Condensed Matter Physics,College of Physical Science and Technology,Yili Normal University,Yining 835000,China
    2.State Key Laboratory of Polymer Physics and Chemistry,Changchun Institute of Applied Chemistry,Chinese Academy of Sciences,Changchun 130022,China
  • Received:2023-12-14 Online:2024-04-10 Published:2024-02-21
  • Contact: SUN Zhaoyan E-mail:zysun@ciac.ac.cn
  • Supported by:
    the National Key Research and Development Program of China(2022YFB3707303);the National Natural Science Foundation of China(52293471)

摘要:

白炭黑/炭黑混合填料是近年来发展最快的一种新型橡胶材料补强剂, 主要用来改善橡胶材料的动态性能. 为了探究混合填料比例和密炼工艺对仿生橡胶动静态力学性能的影响机制, 设计了两组实验: (1) 固定密炼时间为6 min, 采用不同混合比例的白炭黑/炭黑填料填充仿生橡胶, 并对其分散、 拉伸、 疲劳及滚动阻力等性能进行系统研究. 结果表明, 当白炭黑在填料中的质量分数<50%时, 随着白炭黑质量分数的增加, 硫化胶拉伸强度显著下降, 这是由于混合填料引起的分子链最大交联程度下降所致. 进一步增加白炭黑含量, 硫化胶的拉伸性能变化不明显, 但分散等级由约1级提升至约9级, 填料团聚体尺寸的减小使硫化胶的断裂伸长率和伸张疲劳寿命显著提高. (2) 在固定混合比(填料中白炭黑的质量分数为75%)条件下, 研究了密炼时间对硫化胶动静态力学性能的影响. 结果表明, 在2~10 min密炼时间范围内, 4 min密炼即显著提升拉伸强度、 300%定伸应力以及断裂伸长率, 同时降低滚动阻力. 主要原因是此时分子链的最大交联程度较大, 分散等级和分散度较高. 进一步延长密炼时间(6~10 min), 填料在橡胶中易发生重新聚集, 聚集体平均粒径增大且分散度下降, 对橡胶的动静态性能会产生负面影响.

关键词: 仿生橡胶, 白炭黑, 炭黑, 动静态力学性能

Abstract:

Silica/carbon black(CB) mixed filler is one of the fastest-developing novel reinforcement agents for rubber materials in recent years, primarily employed to enhance the dynamic performance of rubber materials. In order to explore the influence of hybrid filler ratios and mixing processes on the dynamic and static mechanical properties of bionic rubber, two sets of experiments were designed: (1) with a fixed mixing time of 6 min, the bionic rubber was filled with silica/CB fillers at different mixing ratios, and a systematic study of properties, such as dispersion, tensile strength, fatigue and rolling resistance of the bionic rubber was conducted. The results show that when the mass fraction of silica in the fillers is less than approximately 50%, the tensile strength decreases with increasing the silica content, attributed to the decrease in the maximum cross-linking degree of molecular chains. However, with a further increase in silica content, the dispersion grade of vulcanizate increases from about 1 to about 9, leading to a reduction in filler agglomerate size and a significant increase in elongation at break and stretching fatigue life. (2) Under fixed mixing ratio conditions(mass fraction of silica in the fillers is 75%), the influence of mixing time on its dynamic and static mechanical properties was studied. The results show that within the studied mixing time range of 2—10 min, 4 min mixing significantly increases tensile strength, 300% modulus, and elongation at break, while reducing rolling resistance. This is mainly attributed to the larger maximum cross-linking degree of molecular chains and higher dispersion level and dispersion at this time. With a further increase in the mixing time(6—10 min), fillers in rubber tend to re-aggregate, leading to an increase in the mean agglomerate size and a decrease in dispersion, negatively impacting the dynamic and static properties of the rubber.

Key words: Bionic rubber, Silica, Carbon black, Dynamic and static mechanical property

中图分类号: 

TrendMD: