Ultrasonic Devulcanization of Scrap Tire Rubbers: Science and Engineering

废轮胎橡胶的超声波脱硫：科学与工程

• 批准号: 0084740
• 负责人: Avraam Isayev
• 金额: $ 27.99万
• 依托单位: University of Akron
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-09-01 至 2004-02-29
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0084740&HistoricalAwards=false
• 关键词: Ultrasonic; Devulcanization; Scrap; Tire; Rubbers

The main objective of this research is to develop basic knowledge and to design the high capacity equipment for the new ultrasonic technology of recycling ground tire rubber (GRT). It has been discovered in the earlier research that through the application of certain levels of ultrasonic amplitudes in special devices, the three-dimensional network in reinforced and non-reinforced vulcanized elastomers can be broken down leading to devulcanization within a short period of time of the order of a few seconds. As the most desirable consequence, ultrasonically treated GRT becomes soft thereby enabling the rubber to be reprocessed, shaped, and revulcanized alone or in blends with virgin rubbers and plastics.The study outlines a series of tasks enabling: (1) the design of new equipment for continuous ultrasonic devulcanization of GRT; (2) the identification of the effect of powerful ultrasound on structure and properties of model unfilled and carbon black filled styrene-butadiene, natural, butadiene, and EPDM rubber vulcanizates and their mixtures which are the constituents of GRT; (3) to reveal the effect of carbon black on the ultrasonically induced mechanochemical reactions in each model rubber and their mixtures; (4) to investigate the effect of ultrasonic treatment of each model rubber vulcanizates on the mechanical properties of their blends with virgin rubber upon revulcanizations; (5) to establish the optimal processing conditions enabling one to obtain the devulcanized GRT-based materials with high mechanical properties; (6) to develop the theory of rubber network degradation and to develop computer simulations of the reactors as an aid to scaling the process.

本研究的主要目的是为回收废轮胎橡胶（GRT）的新型超声波技术开发基础知识并设计高容量设备。 早期研究发现，通过在特殊装置中施加一定水平的超声波振幅，可以在几秒量级的短时间内破坏增强和非增强硫化弹性体中的三维网络，从而导致脱硫。 最理想的结果是，经过超声波处理的 GRT 变得柔软，从而使橡胶能够单独或与原始橡胶和塑料共混进行再加工、成型和再硫化。该研究概述了一系列任务，以实现：（1）设计用于 GRT 连续超声波脱硫的新设备； (2) 鉴定强超声对模型未填充和炭黑填充的苯乙烯-丁二烯、天然、丁二烯和三元乙丙橡胶硫化橡胶及其混合物（GRT 的组成部分）的结构和性能的影响； (3) 揭示炭黑对每种模型橡胶及其混合物中超声波诱导的机械化学反应的影响； (4) 研究超声波处理各型号硫化胶对其与生胶共混物再硫化力学性能的影响； (5)建立最佳加工条件，以获得具有高机械性能的脱硫GRT基材料； (6) 发展橡胶网络降解理论并开发反应器的计算机模拟以帮助扩大该过程。