Abstract
ABSTRACT In order to improve the inhibition performance of an inhibitor, a microcapsule material was prepared with modified chitosan and lipoic acid as the main raw materials, and a gel material was prepared with polyethylene glycol and sodium alginate. By combining the microcapsule and gel, a composite inhibitor SAA/PEG-MALA was finally obtained, with a good inhibition effect and a long-lasting inhibition time. A scanning electron microscopy experiment showed that SAA/PEG-MALA has a unique radioactive pore structure, thus improving the moisture absorption and water retention performance. A thermogravimetric experiment showed that, after treatment with SAA/PEG-MALA, the characteristic temperature of the coal samples were increased, of which the dry cracking temperature T2 was increased by 16.9°C, and the thermal decomposition temperature T5 was increased by 72.2°C. A differential scanning calorimetry experiment showed that the transition temperature of an SAA/PEG-MALA-inhibited coal sample increased by 31.6°C, and the heat release decreased by 5828.0 J/g. A thermogravimetric infrared experiment showed that the average inhibition rate of the SAA/PEG-MALA was 94.04%, and its average inhibition life was 27.43 min. These results indicate that SAA/PEG-MALA can effectively inhibit the spontaneous combustion of coal.
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