微米级滑石粉补强丁腈橡胶的性能研究

Performance of Nitrile Rubber Filled with Micro-talc Powder

为使滑石粉补强丁腈橡胶(NBR),研究了滑石粉的粒径、用量和表面经偶联剂处理时对NBR硫化胶的力学性能影响。结果表明:滑石粉在粒径很小、用量适中时才显示较好的补强效果,2 500目、60份时橡胶的拉伸强度为13.5 MPa、撕裂强度41.4 kN/m;用质量分数为1%的KH550处理滑石粉,橡胶的综合性能获得进一步提高,其拉伸强度可达14.1 MPa、撕裂强度48.1 kN/m,SEM分析指出这与偶联剂改善了滑石粉在NBR中的分散性及相容性有关。

In order to reinforce the nitrile rubber （NBR）with the micro-talc powder, the effects of the particle size and the content and the surface treatment by the silane coupling agent of the talc on the mechanical properties of NBR are studied in this paper. It is shown that the talc has better reinforcement results when its particle size is very small with its optimal content and NBR has the tensile strength of 13.5 MPa and the tearing strength of 41.4 kN/m when the talc has the particle size of 2500 mesh and the content of 60phr, and that the comprehensive properties of NBR can be fimher raised with the tearing strength of 14.1 MPa and the tearing strength of 48.1kN/m when the surface of the talc is treated by 1% （mass concentration） KH550, and that the dispersivity and compatibility improved by KH550 between the talc and NBR have been verified through the SEM.