高流动性PA6在GF增强PA66体系中的应用

摘要

Taking nylon (PA) 66 and high-flow PA6 as martix resin,PA66/high-flow PA6/glass fiber (GF) composites were prepared by melt blending (the mass fraction of GF in the composite is 40%),and effects of the high-flow PA6 content on the crystallization and melting behaviours,heat deformation temperature (HDT),melt flow rate (MFR),surface performances and mechanical properties of the composites were studied. The results show that when the mass ratio of high-flow PA6 and PA66≤1/4, the crys-tallization and melting behaviours of the composites are similar with PA66,and HDT decreases slightly with the increase of the high-flow PA6 content. MFR increases obviously with the increase of the high-flow PA6 content. When the mass ratio of high-flow PA6 and PA66 is 1/4,the problem of floating fiber on the composite part surface is solved,and comparing with the condition of unadding high-flow PA6,the tensile and flexural strength of the composite have no change basically,but the Charpy and Cantilever notched impact strength increase by 17.6%and 16.4%respectively,MFR is 18.3 g/10 min and increases by 100%, which indicate that the composite at this high-flow PA6 content has best comprehensive properties.%以尼龙(PA)66和高流动性PA6为基体树脂，采用熔融共混方法制备了PA66/高流动性PA6/GF复合材料，考察了高流动性PA6用量对复合材料的结晶熔融行为、热变形温度(HDT)、熔体流动速率(MFR)、表面性能和力学性能的影响。结果表明，在GF质量分数为40%的情况下，当高流动性PA6用量不高于基体树脂总质量的20%时，复合材料表现出PA66的结晶熔融行为特征，HDT随高流动性PA6用量的增加略有下降；随高流动性PA6用量增加，复合材料的MFR显著提升；当高流动性PA6用量达到基体树脂总质量的20%时，复合材料制品表面浮纤问题得到解决，此时复合材料的拉伸和弯曲强度与未加高流动性PA6时相当，简支梁和悬臂梁缺口冲击强度则分别提高了17.6%和16.4%，MFR为18.3 g/10 min，较未加高流动性PA6时提升1倍，具有最佳的综合性能。