자동차용 헤드램프의 플라스틱 소재 Haze 저감 방법에 관한 연구

Abstract

In this study, the cause of the decrease in transmittance of the outer lens among the causes of the decrease inthe amount of light in the automobile headlamp was identified, and the improvement method was selected to determinethe effect. The causes of defects that lower the transmittance of the outer lens are divided into a moisture problem anda haze problem. The moisture problem is caused by the temperature difference between the inside and the outside of thehead lamp, and the haze problem occurs when the heat inside the head lamp evaporates the haze component containedin the plastic material and attaches it to the outer lens. In order to improve the haze problem that occurs in plastic rawmaterials, the structures of the bulb light source type headlamp and the LED chip light source type headlamp wereanalyzed. Among them, the housing material of the LED chip light source type headlamp, which is structurally prone tohaze gas, was selected as the test target. In the mass-production injection process of the housing, the drying process wasselected as a method to minimize haze gas without adding a separate production process. After extracting a sample everydrying time at a constant drying temperature, the sample was put into a haze tester and the residual amount of haze gaswas measured. As a result, it was confirmed that the residual amount of Haze gas in the material decreased as the dryingtime increased.