共改性煤粉增强丁苯橡胶的硫化、力学和热稳定性能研究

Study on vulcanization and mechanical and thermal stabilities of SBR reinforced with co-modified coal

将硅烷偶联剂KH-560和硫化促进剂CZ共改性煤粉(Coal)作为增强填料加入到丁苯橡胶(SBR)中制备改性SBR/Coal复合材料,通过设置不同的共改性Coal的添加量,寻找KH-560、CZ共改性Coal增强丁苯橡胶的最佳实验配比。结果表明,KH-560的最佳添加量为Coal质量的5%,此时SBR/Coal-KH560复合材料的力学性能最佳;KH-560和CZ改性Coal可以明显减少Coal团聚现象,在丁苯橡胶中均匀分散。当Coal-KH560-CZ添加量为40%时,与纯SBR相比,拉伸强度由1.66 MPa升高至2.9 MPa,断裂伸长率由295%升高至390%,撕裂强度由7.1 N/mm增加至11.6 N/mm,复合材料的力学性能和热稳定性能得到改善,加工性能也得到较大提升。

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.