Preparation and Sealing Performance of a New Coal Dust Polymer Composite Sealing Material

الملخص EN

In this study, a new coal-dust polymer composite material (CP) was fabricated to improve the borehole gas drainage effect and address the limitations of traditional sealing materials.

This material used coal dust generated during underground drilling construction as filler, amino resin as binder, and also some other additives.

Based on the orthogonal test scheme, 16 groups of experiments were conducted to investigate the effects of coal-dust content, water-material ratio, and cross-linking agent content on viscosity, 3-day (3-d) compressive strength, and gel time of the CP.

The influences of the various factors were studied using a range of analytical methods to obtain the optimal proportion of the CP.

Moreover, the mechanical property and microstructure of the CP were also analyzed to evaluate 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.