Automotive hood bracket adhesion technology analysis: the preferred choice of structural adhesive to replace mechanical connections

In modern automotive manufacturing, to reduce weight and improve structural strength, the components of the engine compartment are increasingly using lightweight materials such as aluminum alloy and engineering plastics. The base of the hood bracket as the connecting point, its robustness directly affects the driving safety and structural stability of the vehicle. There are problems with stress concentration, poor sealing, and low assembly efficiency, so structural adhesion has become a better solution. Background and challenges of hood bracket bondingWith the development of lightweight cars and electrification, the design of the entire vehicle is becoming more modular and the structure of the components is more precise. In the hood system, the bracket base as the key connection structure, bearing frequent opening / closing, withstanding wind pressure, vibration shock and other loads, must have high strength, fatigue resistance, environmental aging and other characteristics.Traditional pain points:Screw / rivet connection: complex process, long assembly time, easy to crack due to stress concentration;Welding method is limited: plastic / composite materials are not suitable for hot melt welding, the thermal impact zone will weaken the structural strength;Insufficient sealing and vibration suppression: water vapor infiltration and resonance problems may occur at the connection.Therefore, automotive host plants are increasingly inclined to use structural adhesive methods to replace traditional connections, not only to improve structural strength, but also to optimize the process process, to achieve the goal of lightweight and cost-effective.Adhesive Performance Requirements AnalysisFor the adhesion needs of the hood bracket base, the selected adhesive must meet the following multi-faceted performance requirements:Performance Dimensions Detailed RequirementsHigh strength adhesion Shear strength > 20 MPa to ensure that it does not fall off or move under high load and high vibration conditionsWeatherproof / temperature resistant Can withstand -40 ℃ ~ + 120 ℃ or even higher temperature shock, resistant to salt mist,…