Because of the unsatisfactory dust suppression efficiency, coal dust still threatens production safety and personnel health. In order to understand the influence of the chemical microstructures of the surfactant on the wetting ability and to facilitate the rapid selecting of surfactants with good wetting performances for specific coal dust, fatty acid methyl ester ethoxylate (FMEE), dodecyl dimethyl betaine (BS-12), sodium fatty acid polyoxyethylene ether carboxylate (AEC), and dodecyl dimethyl benzyl ammonium chloride (DDBAC) were selected in this paper to study the wetting ability of these four surfactants on the bituminous coal dust in Tongchuan, Shaanxi province of China. First, the main functional groups and carbon composition of the coal dust and surfactants were determined by Fourier transform infrared spectroscopy and carbon-13 nuclear magnetic resonance spectroscopy experiments. Second, the drop shape analysis system DSA100 was used to measure the equilibrium contact angle of the surfactant solution with a concentration of 0.06% on bituminous coal dust. The relationship between the chemical microstructures of surfactants and contact angles was analyzed, and the main influencing factors were obtained. The results showed that the contact angle of DDBAC on coal sample dust was the smallest. In addition, the contents of hydroxyl, aromatic ring carbon, unprotonated carbon, and bridged aromatic carbon in surfactants had significant linear correlations with wettability, and the increase of their contents would lead to the decrease of contact angle. According to the results of correlation analysis and curve fitting, the evaluation model of influencing factors on the wettability to bituminous coal dust was established.

中文翻译：

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表面活性剂化学微观结构对铜川矿区煤尘润湿效果影响的试验研究

由于抑尘效率不理想，煤尘仍然威胁着生产安全和人员健康。为了了解表面活性剂的化学微观结构对润湿能力的影响，促进快速选择对特定煤尘具有良好润湿性能的表面活性剂，脂肪酸甲酯乙氧基化物（FMEE）、十二烷基二甲基甜菜碱（BS-12 )、聚氧乙烯醚羧酸钠(AEC)和十二烷基二甲基苄基氯化铵(DDBAC)，研究了这四种表面活性剂对陕西铜川烟尘的润湿能力。第一的，通过傅里叶变换红外光谱和碳13核磁共振光谱实验确定了煤尘和表面活性剂的主要官能团和碳组成。其次，使用液滴形状分析系统DSA100测量浓度为0.06%的表面活性剂溶液对烟煤粉尘的平衡接触角。分析了表面活性剂的化学微观结构与接触角的关系，得出了主要影响因素。结果表明，DDBAC对煤样粉尘的接触角最小。此外，表面活性剂中羟基、芳环碳、未质子化碳和桥联芳碳的含量与润湿性呈显着线性相关，并且它们含量的增加会导致接触角的减小。根据相关分析和曲线拟合的结果，建立了对烟煤粉尘润湿性影响因素的评价模型。