The usage and function of sealing silicone on car lights

Car lights are an indispensable part of the car. They play an important role in night lighting, driving signals, fog collision prevention, and turn signs. They are an important guarantee for the safe driving of the car. In the production of automobile lights, in order to seal the light distribution mirror and the lamp housing, sealant must be used for bonding.

In the application of car light bonding, first of all, the car light sealant is affected by the heat emitted by the bulb. In the corresponding high temperature environment, it must ensure that its bonding and sealing properties do not change, and at the same time, it must not release organic gases and produce atomization. phenomenon, and does not turn yellow, affecting the appearance.

Secondly, when the car light sealant is exposed to ultraviolet rays in the sun, aging phenomena such as cracking of the glue layer will not occur, which requires the car light sealant to have good UV aging resistance; finally, the car light sealant will also be affected by Long-term erosion by water vapor and rainwater must ensure that its sealing performance will not be affected.

Due to its unique molecular structure, silicone sealant products have the characteristics of good adhesion, excellent high and low temperature resistance, excellent weather resistance, good hydrophobicity, excellent electrical properties and chemical corrosion resistance. Silicone sealants are widely used in car light sealing.

In the production of car lights, most of the materials are plastic. The lamp housing is made of ABS, PC, PP, etc., and the light-distributing mirror material has changed from traditional glass to the now widely used PC material. Good adhesion can ensure the airtightness of the car lights and prevent them from falling off. If the bonding performance is not good, the car lights are prone to water leakage and other problems, which will greatly reduce the service life of the car lights.

When a car is driving for a long time, the headlights will maintain a high temperature. At the same time, the high temperature will also be transmitted to the headlight sealant, destroying the adhesiveness of the sealant, causing the carlight seal to fail. Special usage environments require sealants to have excellent high temperature resistance.

When a car is driving in a severely cold area, as the driving time increases, the ambient temperature inside the headlights increases, and the headlight sealant gradually rises from sub-zero temperatures to high temperatures. After the car stops driving, the temperature of the headlight sealant will slowly drop again. to outdoor temperature. The silicone sealant has been tested in high and low temperature cycles and has shown no cracking, partial delamination or bonding damage, showing excellent low temperature flexibility. After high and low temperature cycle testing, the silicone sealant showed no cracks or delamination in appearance. Therefore, silicone sealants with excellent high and low temperature resistance are applied to car lights to ensure that the car lights can work normally under various conditions.

Cars are used outdoors for a long time. To ensure that the service life of the car lights can be extended, the car light sealant needs to have excellent UV aging resistance, and the appearance of the silicone sealant should not change significantly.

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