炭黑与大小橡胶粒子的相互作用及其受停放时间的影响
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海南省自然科学基金资助项目(521RC1039);国家自然科学基金资助项目(51603230);现代农业产业技术体系建设专项资金(CARS-33-JG2);广东省天然橡胶加工重点实验室资助(2019B121203004);农业农村部热带作物产品加工重点实验室开放课题(KFKT202003)


Interaction Between Large and Small Rubber Particles with Carbon Black and the Influence of Storage Time
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    摘要:

    采用反复离心纯化的方法制备出大、小橡胶粒子的胶乳样品,干燥得到天然橡胶生胶,与炭黑混炼得到相应混炼胶,研究了各样品与炭黑的相互作用及其随停放时间的变化。研究表明,小橡胶粒子胶乳所制备的天然橡胶相应混炼胶中结合胶含量较高,随停放时间延长,添加了小橡胶粒子的样品结合胶含量先上升后下降,大橡胶粒子样品结合胶含量则持续上升;扫描电子显微镜的分析结果表明,小橡胶粒子胶乳所制备的天然橡胶中炭黑分散性差,炭黑与橡胶基体相容性差,存在较多附聚体,大橡胶粒子胶乳所制备的样品中炭黑分散性则较优。差示扫描量热仪对结合胶玻璃化转变特性的分析表明,各结合胶样品在玻璃化转变前后的比热流差值随停放时间的延长先增大后减小,这是由于样品中的橡胶连续相先增加后减少。总而言之,小橡胶粒子胶乳所制备的天然橡胶相应混炼胶中所测结合胶含量更高,但与炭黑相容性差,多为受限于填料内部的包覆橡胶。

    Abstract:

    Small and large natural rubber particles were prepared by centrifugation. After that, the latexes were dried and mixed with carbon black to obtain compound samples. The interaction between rubber matrix and carbon black and the influence of storage time were studied. It is shown that the rubber compound obtained from small rubber particles has a higher bound rubber content. As the storage time prolonging, the bound rubber content of samples with small rubber particles increases at first and decreases at last while that of sample obtained from large rubber particles keeps rising. The results of scanning electron microscopy show that the dispersion of carbon black and compatibility between carbon black and rubber matrix in the samples prepared by small rubber particle latex is poor, with lots of trapped rubber existing. While the dispersity of carbon black in the samples prepared by large rubber particle latex is better. The glass transition characteristics of bound rubber samples measured by differential scanning calorimeter shows that the difference value of specific heat flow before and after glass transition of the bound samples increases firstly and then decreases with the prolonging of storage time, because the continuous rubber phase increases firstly and then decreases. In a word, the measured bound rubber content of natural rubber prepared from small rubber particle latex is higher, but the compatibility with carbon black of that is poor, and most of them are trapped rubber limited in filler particles.

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何思敏,张福全,谷丰收,陈松,赵添琪,廖小雪,廖禄生.炭黑与大小橡胶粒子的相互作用及其受停放时间的影响[J].高分子材料科学与工程,2022,38(9):88-94.

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