玻璃纤维改性PA66冲击强度的影响因素分析

Analysis of influential factors on impact strength of glass fiber modified PA 66

以质量分数33%的玻璃纤维改性聚己二酰己二胺(PA 66)切片为基础,分析了基料黏度、玻璃纤维粗细、增韧剂、挤出工艺等对PA 66复合材料的冲击性能的影响。结果表明:随基料树脂黏度增大,PA 66复合材料的冲击性能增加,其中无缺口冲击强度增加幅度大;玻璃纤维直径越小,PA 66复合材料的冲击强度越高,玻璃纤维直径以13~15μm为宜;增韧剂本体强度小,增韧效果好,马来酸酐接枝茂金属乙烯-辛烯共聚物(POE-g-MAH)的性价比最佳;PA 66复合材料缺口冲击强度随增韧剂用量增加而增加,无缺口冲击强度呈先增大后减小再增大的趋势,复合材料中加入增韧剂质量分数2.5%较适宜;采用高温低转速挤出工艺时PA 66复合材料冲击强度较好。

The effects of base polymer viscosity, glass fiber thickness, toughening agent and extrusion process on the impact properties of PA 66 composite material were studied by using polyhexamethylene adipamide （PA 66） chip modified with 33% glass fiber by mass fraction. The results showed that the impact property of PA 66 composite was increased with the increase of base polymer viscosity, and the non-notched impact strength had a great growth; the glass fiber should properly be 13 - 15 p^m in the diameter because the impact strength of PA 66 composite was increased with the decrease of fiber diameter ; the toughening a- gent with low strength provided good toughening effect, and metallocene ethylene/octene copolymer modified with maleic an- hydride（POE-g-MAH） was of the best performance-price ratio; the notched impact strength of PA 66 composite was increased and the non-notched impact strength was increased then decreased and finally increased with the increase of toughening agent a- mount , and the mass fraction of toughening agent should properly be 2.5% in the composite; and the impact strength of PA 66 composite was fairly good while high-temperature low-rotation speed extrusion process applied.