Basic Studies of Continuous Ultrasonic Devulcanization of Rubbers

橡胶连续超声脱硫的基础研究

• 批准号: 9312249
• 负责人: Avraam Isayev
• 金额: $ 31.03万
• 依托单位: University of Akron
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1994
• 资助国家: 美国
• 起止时间: 1994-06-01 至 1997-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9312249&HistoricalAwards=false
• 关键词: Basic; Studies; Continuous; Ultrasonic; Devulcanization

9312249 Isayev The main objective of the project is to develop basic knowledge for a new science-based technology of continuous devulcanization of vulcanized elastomers. It is well known that vulcanized elastomers having a three-dimensional network cannot flow under the effect of heat and/or pressure. It has been discovered that through the application of certain levels of ultrasolic amplitudes in special devices in the presence of pressure and optionally heat, the three-dimensional network of vulcanized elastomer can be broken down within a short period of time on the order of one second or less. As a most desirable consequence, ultrasonically treated vulcanized rubber becomes soft, thereby enabling this material to be reprocessed, shaped, and revulcanized in a manner similar to that employed with unvulcanized elastomer. The study outlines series of experiments enabling us to (i) identify an aptitude of polysulfidic, monosulfidic, and carbon- carbon crosslinks to ultrasonic devulcanization; (ii) to establish optimal conditions for the devulcanization process; (iii) to evaluate the rheological properties of devulcanized rubbers; and (iv) to measure the mechanical performance of revulcanized rubber products made of devulcanized rubber. The recycling of vulcanized elastomers (primarily used tires) has become a major environmental and social issue. The development of a novel technique for the reclaiming of rubber will have a significant impact on the further expansion of a recycling technology base through the optimization of the process and new discoveries.

小行星9312249 该项目的主要目标是开发基本的 新的科学技术的知识， 硫化弹性体的脱硫。 众所周知的是 具有三维网络的硫化弹性体不能 在热量和/或压力的作用下流动。 已经 发现通过应用一定程度的 在特殊器械中的超声振幅， 压力和任选的加热， 硫化弹性体可以在短时间内分解， 一秒或更少的时间。作为最理想的 结果，超声波处理的硫化橡胶变软， 从而使该材料能够被再加工、成形， 以与未硫化的类似的方式再硫化 弹性体。 该研究概述了一系列实验，使我们能够 (i)确定多硫化物、单硫化物和碳- 碳交联超声波脱硫;（二）建立 脱硫过程的最佳条件;（iii） 评估脱硫橡胶的流变性能;以及 (iv)测量再硫化橡胶的机械性能 由脱硫橡胶制成的产品。 硫化弹性体的回收（主要是旧轮胎） 已成为一个重大的环境和社会问题。 发展 一种新的橡胶再生技术将有一个 通过优化工艺和新发现，对进一步扩大回收技术基础产生重大影响。