摘要
针对自然曝露后出现的虎皮纹缺陷现象设计了保险杠自然曝露试验,并对缺陷的发生的原因进行了研究分析。结果发现,保险杠经自然曝露试验后出现了黑白相间虎皮纹缺陷;相比于虎皮纹的黑段,白段的色差值更大且存在大量微裂纹,表面O元素含量急剧上升,表现出明显的老化现象;保险杠材料中的橡胶增韧相发生了不平衡剪切取向,白段的取向程度明显高于黑段,导致白段存在较大的取向内应力,在外界环境应力作用下更容易断裂,从而更容易产生大量微裂纹。
In this study,a natural exposure test of bumper was designed for solving the problem of a tiger stripe defect after natural exposure,and the causes of this defect were analyzed. The results indicated that the bumper showed some black and white tiger stripe defects after the natural exposure test. Compared to the black section of tiger stripe,the color difference in white section was significant,and there were many microcracks. The content of O element on the surface increased drastically,indicating a visible aging phenomenon. The rubber toughening phase in bumper material presented an unbalanced shear orientation. The orientation degree of the white segment is clearly greater than that of the black segment. This leads to the existence of large orientation internal stress in the white segment. It is easier for the bumper to fracture under the action of external environmental stress,resulting in a large number of microcracks accordingly.
作者
王伟健
WANG Weijian(Research&Development Center,Guangzhou Automobile Group Co,Ltd,Guangzhou 511434,China)
出处
《中国塑料》
CAS
CSCD
北大核心
2021年第7期87-90,共4页
China Plastics
关键词
聚丙烯
保险杠
自然曝露
虎皮纹
缺陷
外观
polypropylene
bumper
natural exposure
tiger stripe
defect
aspect
