两种不同类型废轮胎热分解特性及其溶胀性能

Thermal decomposition characteristics and swelling performance of two kinds of scrapped tires

文中针对自行车和汽车废轮胎的热分解特性和溶胀性能进行了详细地研究。废轮胎热分解特性利用热重分析法对其热分解过程进行动力学分析,结果发现,由于组成不同,两者热失重曲线存在明显的差异,热失重过程符合一级动力学模型,在温度230~320℃时,汽车废轮胎和自行车废轮胎的热分解活化能为25 kJ/mol,350~450℃温度段活化能分别为80.5 kJ/mol和49.1 kJ/mol。溶胀性能的研究主要考察了苯、乙酸乙酯和二硫化碳,在不同温度下对不同尺寸的块状废轮胎的溶胀效果的影响,结果表明,溶胀过程不完全遵守溶解度参数原则,但符合准一级动力学模型,三种有机溶剂对自行车废轮胎的溶胀过程活化能较小,溶胀更易发生;根据SEM分析,溶胀干燥后废轮胎表面具有更多孔隙,能提升传质效果。

The paper probes into the thermal decomposition characteristics and swelling properties of scrapped bicycle tires and the automobile one sin detail.The kinetics of the tires'thermal decomposition process was studied by thermal gravimetric analysis to obtain the decomposition characteristics.The results showed that,due to different compositions,the two kinds of tires differed considerably in thermogravimetric curves,and that the process conformed to the first-order kinetic model.In the temperature range of 230~320℃,the thermal decomposition activation energies of the scrapped automobile tires and the bicycle ones were both about 25 kJ/mol.In the temperature range of 350~450℃,the activation energies were 80.5 kJ/mol and 49.1 kJ/mol,respectively.The effects of benzene,ethyl acetate and carbon disulfide on the swelling performance of the scrapped tires in different sizes at different temperatures were investigated.The results showed that the swelling process didn't comply with the solubility parameter principle,while it conformed to a quasi-first-order kinetic model.The three organic solvents lowered the activation energy of the scrapped bicycle tires'swelling process,facilitating the process.According to the SEM analysis,the scrapped tires soaked in the solvents had more pores on their surface after they were dried,which was beneficial to improving the mass transfer effect.