4. Spot welding glue

Automobile bodies are generally welded from steel plates, so the existence of baking seams is inevitable. The application of spot welding glue ensures the sealing quality, which is characterized by fixed conductivity, good adhesion before curing, no pollution of phosphating liquid and electrophoresis liquid, and no organic silicon substances.

5. Anti-stone chip coating

When the car is driving fast, the bottom plate, wheel cover, skirt, etc. will be impacted by the sand and gravel brought by the wheels, causing the coating to peel off, the steel plate is corroded to resist this impact and shock absorption, and a layer of glue should be applied to the bottom of the large body Class. Hit Damping Coatings. Now it is used as a kind of material for automobile anti-stone impact, thermal insulation and damping coatings. ①A solvent type with asphalt as the main material. Asphalt-based coatings are inexpensive and require low construction conditions. They are suitable for primer coatings for trucks and large passenger cars. Although many automobile manufacturers are still using them, they are gradually being used by water-based coatings because of their environmental pollution and harm to operators. Trends in paint replacement. ②Water-based type with synthetic resin as the main material. Water-based paint is a new material developed in recent years. It is based on acrylate emulsion and is composed of inorganic heat-insulating fillers. Non-toxic and non-flammable are its outstanding advantages. ③Solvent-free type with PVC resin as the main body. PVC-type vehicle bottom coating is the most widely used one. Its composition, such as weld glue, needs to be plasticized at 130-140 ℃ after spraying.

Six, anti-vibration heat insulation damping film

The damping heat insulation sheets laid on the floor of the car and the floor of the cab of the truck, the front wall and the wheel cover are also mainly made of asphalt, and are composed of rubber powder and inorganic fillers. After the paint is dried, it is spread on the bottom plate. When the middle coat or top coat is dried, it is heated and softened, and it is closely attached to the covered parts to reduce vibration, heat insulation and prevent noise transmission.