汽车塑料仪表板乙醛含量溯源分析及控制方法

Trace Analysis and Control Method of Acetaldehyde Content in Vehicle Plastic Dashboard

采用一立方仓法对车内重点零件进行醛类检测,并利用微箱对问题零件进行溯源分析及整改验证。实验表明,内饰件中仪表板乙醛含量明显偏高,特别是PP材质在高温剪切及氧化反应等过程中,会形成大量乙醛分子。通过研究PP粒料中抗氧化剂含量、挤出温度、后处理时间及散件注塑温度、通风时间等对仪表板乙醛含量的影响,表明当抗氧化剂含量在1%、挤出温度在190℃、后处理烘烤时间超过8 h、另外散件注塑温度在190℃、注塑后立刻通风2 min时,仪表板中乙醛含量明显降低。

Standard VOC test chamber is used to detect acetaldehyde from key interior parts,micro warehouse is used to trace the source and correction and verification of the acetaldehyde of defect components.The results show that the content of acetaldehyde from the dashboard is obviously high,especially due to high temperature shearing and oxidation reaction,a large number of acetaldehyde molecules will be formed in PP material.Through a series of studies on antioxidant content,extrusion temperature,post-treatment time,injection temperature and ventilation time of PP parts,it indicates that acetaldehyde content in dashboard can be significantly reduced under the following conditions:1%antioxidant content,190℃extrusion temperature,over 8 h of post-treatment baking,190℃injection temperature of PP parts,and 2 min ventilation immediately after injection.