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Preparation and sealing performance of a new coal dust polymer composite sealing material

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Document pages: 10 pages

Abstract: In this study, a new coal dust polymer composite (CP) was prepared to improve the effect of borehole gas drainage and solve the limitations of traditional sealing materials. The material uses coal dust produced during underground drilling construction as filler, amino resin as binder and some other additives. Based on the orthogonal test scheme, 16 groups of tests were carried out to study the effects of coal dust content, water material ratio and crosslinking agent content on viscosity, 3-D compressive strength and viscosity. The effects of various factors on CP were studied by various analysis methods, the optimal ratio of CP was obtained, and the mechanical properties and microstructure of CP were EVA analyzeduate the sealing performance of this material. Results showed that this material exhibited obvious plastic characteristic and could provide an effective support for the borehole; it can adapt to the deformation of the borehole to some extent and achieve a long-term sealing effect. The scanning electron microscopy (SEM) results show a good correlation between the resin molecules and coal dust inside the material, which were conducive to improve the sealing performance of the CP material.

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