中国塑料 ›› 2021, Vol. 35 ›› Issue (7): 87-90.DOI: 10.19491/j.issn.1001-9278.2021.07.015

• 加工与应用 • 上一篇    下一篇

保险杠自然曝露后虎皮纹缺陷的研究

王伟健()   

  1. 广州汽车集团股份有限公司汽车工程研究院,广州 511434
  • 收稿日期:2021-01-12 出版日期:2021-07-26 发布日期:2021-07-21

Study on Tiger Stripe Defect of Bumper after Natural Exposure

WANG Weijian()   

  1. Research&Development Center,Guangzhou Automobile Group Co,Ltd,Guangzhou 511434,China
  • Received:2021-01-12 Online:2021-07-26 Published:2021-07-21
  • Contact: WANG Weijian E-mail:wangweijian@gacrnd.com

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。

关键词: 聚丙烯, 保险杠, 自然曝露, 虎皮纹, 缺陷, 外观

Abstract:

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.

Key words: polypropylene, bumper, natural exposure, tiger stripe, defect, aspect

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