ZDMA改性Si_(3)N_(4)制备ZDMA@Si_(3)N_(4)/EPDM复合材料及性能研究

Construction of ZDMA@Si_(3)N_(4)Hybrids by Modifying Si_(3)N_(4) with ZDMA:Preparation and Properties Research of ZDMA@Si_(3)N_(4)/EPDM Composites

以羧酸锌盐二甲基丙烯酸锌(ZDMA)为改性剂,湿法改性处理陶瓷纳米氮化硅粉体(n-Si_(3)N_(4)),制备ZDMA@Si_(3)N_(4)/EPDM复合材料,研究ZDMA@Si_(3)N_(4)对复合材料力学性能、耐磨性能及耐油性能的影响。实验结果表明,ZDMA对Si_(3)N_(4)具有很好的表面有机化改性效果,改善了其在EPDM基体中的分散性,同时结构中不饱和键与橡胶大分子链形成共硫化,有效提高了复合材料的交联密度和极性,二者具有良好的协同作用。当ZDMA@Si_(3)N_(4)添加量为15 phr时,ZDMA@Si_(3)N_(4)/EPDM复合材料的拉伸强度和撕裂强度分别提高24.2%和42.8%,阿克隆磨耗磨损体积由0.52 cm^(3)/1.6 km降低至0.14 cm^(3)/1.6 km,100℃*70 h耐热油质量变化率由102%降至87%。

ZDMA@Si_(3)N_(4)/EPDM Composites were prepared using ceramic nano-silicon nitride(n-Si_(3)N_(4))powder,modified with zinc dimethacrylate(ZDMA)by wet modification treatment.In this paper,the effects of ZDMA@Si_(3)N_(4)on the mechanical properties,wear resistance and oil resistance of the composites were investigated.The experimental results show that ZDMA has a good organic surface modification effect on Si_(3)N_(4)and improves its dispersion in the EPDM matrix.At the same time,the unsaturated bonds in the structure of the composite material form co-sulphuration with the rubber macromolecular chain,which effectively improves the cross-linking density and polarity,and ZDMA and Si_(3)N_(4)achieve good synergistic effects.When ZDMA@Si_(3)N_(4)is added at 15 phr,the tensile and tear strength of the ZDMA@Si_(3)N_(4)/EPDM composites are increased by 24.2%and 42.8%,respectively,the Akron abrasion loss is reduced from 0.52 cm^(3)/1.6 km to 0.14 cm^(3)/1.6 km,and the mass change rate after hot oil aging at 100℃for 70 h is reduced from 102%to 87%.