中国塑料 ›› 2023, Vol. 37 ›› Issue (9): 83-89.DOI: 10.19491/j.issn.1001-9278.2023.09.012

• 塑料与环境 • 上一篇    下一篇

2,2′⁃二苯甲酰氨基二苯基二硫化物/氧化锌催化剂降低废旧胶粉脱硫温度的研究

张世博1,2, 杨洋1,2(), 晏永1,2, 傅鹏飞1,2   

  1. 1.云南省土木工程防灾重点实验室,昆明 650500
    2.昆明理工大学建筑工程学院,昆明 650500
  • 收稿日期:2023-04-21 出版日期:2023-09-26 发布日期:2023-09-18
  • 通讯作者: 杨洋(1981—),男,教授,从事工业固体废弃物资源化利用研究和橡胶研究,yangyang0416@kust.edu.cn
    E-mail:yangyang0416@kust.edu.cn
  • 基金资助:
    国家自然科学基金:云南省科技厅重大科技专项计划·“大宗固废规模化应用关键技术研发及工程示范”(202102AG050043)

Study on reduction of desulfurization temperature of waste rubber powder by catalyst DZ

ZHANG Shibo1,2, YANG Yang1,2(), YAN Yong1,2, FU Pengfei1,2   

  1. 1.Yunnan Key Laboratory of Disaster Reduction in Civil Engineering,Kunming 650500,China
    2.Faculty of Civil Engineering and Mechanics,Kunming University of Science and Technology,Kunming 650500,China
  • Received:2023-04-21 Online:2023-09-26 Published:2023-09-18
  • Contact: YANG Yang E-mail:yangyang0416@kust.edu.cn

摘要:

用环烷油作为脱硫溶剂,研究了由2,2'⁃二苯甲酰氨基二苯二硫化物(DBD)和氧化锌(ZNO)按比例混合而成的催化剂DZ对胶粉脱硫温度的影响,在此基础上,以再生胶在三氯乙烯溶液中的溶解度为核心指标,进一步考虑了催化剂掺量、脱硫时间、胶油比的影响,确定了制备低温脱硫胶粉的最优工艺参数。通过扫描电子显微镜、傅里叶红外光谱检测揭示胶粉低温脱硫的机理和微观形貌。结果表明,催化剂DZ对胶粉脱硫起着积极的影响,经过低温脱硫处理的再生胶,粗糙度降低,表面的“凹槽”结构更加明显,能够被更好地应用到工程中;将胶粉脱硫温度降到160 ℃的同时,再生胶溶解度能够达到76.9 %,接近传统动态脱硫法制备的再生胶溶解度,表明降低脱硫温度几乎不会对胶粉的溶解度产生不利影响;低温脱硫胶粉的制备参数可确定为:胶粉和环烷油的质量比为4∶6,催化剂DZ掺量为3 %,搅拌速率为450 r/min,脱硫时间为2 h,脱硫温度为160 ℃。

关键词: 催化剂, 废旧橡胶, 低温脱硫, 高溶解度, 微观形貌

Abstract:

In this study, the effect of a catalyst DZ composed of a proportional mixture of 2,2'⁃dibenzoylaminodiphenyl disulfide (DBD) and zinc oxide (ZNO) on the desulfurization temperature of gum powders was investigated by using naphthenic oil as a desulfurization solvent. Based on this, the solubility of recycled gum in a trichloroethylene solution was taken as a core index, and the effects of catalyst admixture, desulfurization time, and gum⁃oil ratio were further evaluated to determine the optimal process parameters for the preparation of low⁃temperature desulfurization rubber powders. The mechanism and microscopic morphology of low⁃temperature desulfurization of the gum powder were investigated by using scanning electron microscopy and Fourier⁃transform infrared spectroscopy. The results indicated that the catalyst DZ has a positive effect on the desulfurization of rubber powders, and the recycled rubber treated by low⁃temperature desulfurization exhibited reduced roughness alone with a more obvious ‘groove’ structure on the surface. This is advantageous to the engineering applications. The solubility of recycled rubber reached 76.9 % when the desulfurization temperature of rubber powders was lower than 160 ℃, which was close to the solubility of recycled rubber prepared by a traditional dynamic desulfurization method. This indicated that there was almost no adverse effect on the solubility of rubber powders by lowering temperature. The preparation parameters of low⁃temperature desulfurization rubber powders were determined to be a rubber powder/naphthenic oil mass ratio of 4/6, a catalyst DZ⁃doping amount of 3 wt%, a stirring rate of 450 rpm, a desulfurization time of 2 h, and a desulfurization temperature of 160 ℃.

Key words: catalyst, scrap rubber, low temperature desulfurization, high solubility, microscopic morphology

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