Abstract:

Pulverized coal powders were modified jointly with KH⁃560 and a vulcanization accelerator （CZ）， and then the modified coal was added to SBR as a reinforcing filler to prepare the modified coal/SBR composites. The optimal experimental ratio was explored for the co⁃modified coal⁃reinforced SBR by setting different loadings of co⁃modified coal in the composites. The results indicated that the optimum addition amount of KH⁃560 was 5 wt% in the composite， resulting in optimal mechanical properties for the coal⁃KH560/SBR composite. KH⁃560 and CZ modified coal can obviously reduce the agglomeration of coal and disperse uniformly in SBR. When the addition amount of Coal⁃KH560⁃CZ is 40 %， compared with pure SBR， the tensile strength increases from 1.66 MPa to 2.9 MPa， the elongation at break increases from 295 % to 390 %， and the tear strength increases from 7.1 N/mm to 11.6 N/mm. The mechanical properties and thermal stability of the composite are improved， and the processability is also greatly improved.

Key words: coal, styrene butadiene rubber, co?modification, composite material, uniform dispersion