Abstract: Polyformaldehyde material is polymerized from formaldehyde monomer, and always has high formaldehyde emission. Formaldehyde is easily released into the car along with the forming parts, leading to excessive formaldehyde in the car. Due to the small size, large quantity and scattered distribution of parts, it is difficult to solve such pollution problems of in-car air quality according to the traditional methods. Therefore, it is necessary to study scientific and reasonable controlling methods with low cost and operability for the formaldehyde emission. In this paper, the formaldehyde emission of injection samples of low volatile organic compounds, VOCs grade and common grade POM (polyformaldehyde) was studied. The result showed that whatever c-POM (copolymerized formaldehyde) or h-POM (homopolymerized formaldehyde), compared with common grade, low VOCs grade can greatly reduce the formaldehyde emission in the products. At the same time, the possible sources of the parts injected by formaldehyde materials were analyzed and discussed from different perspectives, and the corresponding controlling methods and optimization measures were given.

Key words: In-car air quality; Volatile organic compound; Automotive cabin; Injection parts; Polyformaldehyde; Formaldehyde emission; Controlling methods

摘要： 聚甲醛材料是由甲醛单体聚合而成，通常会有比较高的甲醛释放。甲醛容易随成型零 件散发到车内，导致车内甲醛超标。由于零件尺寸小、数量多、分布散，按照传统方法很难 解决此类车内空气质量污染问题。因此，需要研究一些成本低、操作性强，且科学合理的甲 醛释放量的控制方法。文章研究了低 VOC 牌号和普通牌号 POM 材料注塑样品的甲醛释放量。 结果表明，无论是共聚型 POM，还是均聚型 POM，相比普通牌号，低 VOC 牌号 POM 材料 能大大降低制品中甲醛释放量。同时从不同角度分析和探讨了 POM 材料注塑件中甲醛的可能 来源，并给出了对应的控制方法和优化措施。

关键词: 车内空气质量；挥发性有机物；汽车座舱；注塑件；聚甲醛；甲醛释放量；控制方 法