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针对目前煤矿中频频发生的透水事故与静电引发瓦斯灾害的现状,文章以聚合物水泥、阻燃剂以及导电填料制备出一种适用于煤矿井下能够防止煤壁渗水和封堵瓦斯气体的材料,具有防水、防火、抗静电的特点。系统考查了导电云母粉、石墨、炭黑等多种导电填料及其不同配比的混合填料对涂层干燥时间、表面电阻和吸水率等性能的影响,试验结果表明,添加导电云母粉涂层的电阻值变化不大,无法达到国家煤安标准MT 113-1995的抗静电要求,不适合作为导电填料;添加石墨粉的涂层在质量分数为16%左右时电阻值方可达到106~108Ω;添加炭黑的涂层粘度较大,且质量分数在5%时可达到要求。当石墨粉与炭黑单独添加时,随着导电填料的增加,材料的吸水率逐渐升高,防水性能逐渐下降;从涂膜的抗静电性能和防水性能两方面考虑,最佳的导电填料为石墨与炭黑的混合填料,且最佳的混合比为炭黑:石墨=2:3。
Aiming at the present frequent flooding accidents and gas-induced catastrophic disasters in coal mines, the article uses polymer cement, flame retardant and conductive fillers to prepare a kind of material suitable for preventing water seepage and blocking gas in coal mines, With water, fire, anti-static features. The effects of conductive mica powder, graphite, carbon black and other conductive fillers and their mixed fillers with different proportions on the properties of coating such as drying time, surface resistance and water absorption were systematically investigated. The results show that adding conductive mica powder coating Of the resistance value changes little, can not meet the national coal safety standards MT 113-1995 anti-static requirements, not suitable as a conductive filler; add graphite powder coating mass fraction of 16% when the resistance value can reach 106 ~ 108Ω The viscosity of the coating added with carbon black is larger, and the mass fraction of 5% can meet the requirements. When the graphite powder and carbon black are added alone, the water absorption of the material gradually increases with the increase of the conductive filler, and the waterproof performance gradually decreases. From the viewpoints of the antistatic property and waterproof performance of the coating, the best conductive filler is Graphite and carbon black mixed filler, and the best mixing ratio of carbon black: graphite = 2: 3.