滑石粉填充ABS材料的熔接痕强度研究

Study on Weld Line Strength of Talc-filled ABS Compounds

采用熔融共混法制备了滑石粉填充丙烯腈-丁二烯-苯乙烯共聚物(ABS)材料,研究了滑石粉含量及粒径、复配填充体系以及润滑剂对材料熔接痕强度的影响,利用扫描电子显微镜分析了材料在熔接痕界面处的微观形貌。结果表明,材料的熔接痕强度降低,主要是由于片状滑石粉阻挡聚合物分子链在熔接痕界面处的相互扩散和熔合;通过降低滑石粉含量,与硅灰石复配,添加含有极性基团的酰胺类润滑剂可较好地提高材料的熔接痕强度;当5%(质量分数,下同)的滑石粉与5%的硅灰石复配,并添加1%的改性酰胺类润滑剂时,材料的熔接痕强度达到33.4MPa。

The talc-filled ABS compounds were prepared by melt blending,and the effects of talc content and size as well as lubrication on their weld line strength were investigated.The micro-morphology of the interface between weld line and dispersed fillers was observed with scanning electron microscope.The results indicated that the weld line strength of the compoundsdecreased due to the barrier effect on diffusion and fusion of macromolecular chains by talc sheets.Theweld line strength of ABS could be improved effectively by incorporation of talc at a low content,mixture of talc and wollastonite,or amide lubrication with polar groups.The ABS compounds achieved the weld mark strength of 33.4 MPa when 5 wt%of talc,5 wt%of wollastonite and 1 wt%of modified amide lubrication were added.