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A study on the synthesis of lanthanum methionine and its properties in rubber

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Abstract

The vulcanisation accelerators currently used in rubber manufacturing are often toxic and provide limited benefits to the vulcanisation process. This study presents the benefits of using lanthanum methionine, synthesised from methionine and rare earths, as a non-toxic, multifunctional and environmentally friendly accelerator. We conducted an experiment to test how lanthanum methionine can be used as both a vulcanisation accelerator and an effective anti-ageing agent. In this experiment, accelerants composed of 2-mercaptobenzothiazole and lanthanum methionine complex were added to natural rubber (NR) vulcanisation processes and the resulting vulcanisate qualities were tested. The results of the vulcanisation tests and swelling tests conducted support the hypothesis that lanthanum methionine can enhance the vulcanisation performance of NR. The kinetic parameters were determined by nonlinear fitting of the sulphurisation curves using the sulphurisation kinetic model and the sulphurisation reaction followed Arrhenius’ law. The results of the tests show a lower activation energy for NR vulcanised with lanthanum methionine. The effect of lanthanum methionine on thermal-oxidative degradation was also measured and the kinetic parameters were determined by analysing the thermogravimetric curves at different heating rates with Kissinger and Flynn-Wall–Ozawa model-free methods. The results show that the vulcanised rubber with lanthanum methionine has better thermal-oxidative ageing resistance. These results confirm that lanthanum methionine can function as both a sulphurisation promoter and thermal-oxidative ageing resistance agent. Thus, lanthanum methionine should be used as a safer and more efficient vulcanisation accelerator in the rubber manufacturing industry.

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Funding

This work was financially supported by the National Natural Science Foundation of China (Grant Nos. 51634005).

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Authors and Affiliations

  1. School of Materials and Metallurgy, Inner Mongolia University of Science and Technology, Baotou, 014010, China

    Shuai Li, Zhaogang Liu, Wei Hao, Mei Li, Yanhong Hu & Jinxiu Wu

  2. Key Laboratory of Green Extraction and Efficient Utilization of Light Rare-Earth Resources Ministry of Education, Baotou, 014010, China

    Shuai Li, Zhaogang Liu, Wei Hao, Mei Li, Yanhong Hu & Jinxiu Wu

  3. Inner Mongolia Key Laboratory of Rare Earth Hydrometallurgy and Light Rare Earth Application, Baotou, 014010, China

    Shuai Li, Zhaogang Liu, Wei Hao, Mei Li, Yanhong Hu & Jinxiu Wu

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  1. Shuai Li
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  2. Zhaogang Liu
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  3. Wei Hao
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  4. Mei Li
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  5. Yanhong Hu
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Correspondence to Zhaogang Liu.

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Li, S., Liu, Z., Hao, W. et al. A study on the synthesis of lanthanum methionine and its properties in rubber. J Rubber Res 24, 699–707 (2021). https://doi.org/10.1007/s42464-021-00124-5

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  • DOI: https://doi.org/10.1007/s42464-021-00124-5

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