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 bonding
With 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 Analysis
For the adhesion needs of the hood bracket base, the selected adhesive must meet the following multi-faceted performance requirements:
Performance Dimensions Detailed Requirements
High strength adhesion Shear strength > 20 MPa to ensure that it does not fall off or move under high load and high vibration conditions
Weatherproof / temperature resistant Can withstand -40 ℃ ~ + 120 ℃ or even higher temperature shock, resistant to salt mist, wet heat, UV
High material compatibility Good adhesion to steel plate, aluminum alloy, composite materials (such as SMC), engineering plastics (such as PA, PC + ABS) etc.
Flow performance can be controlled Adhesive coating on facades or complex curved surfaces without flowing, for precise construction
Strong process adaptability Suitable for automatic spot glue, spray glue, heating curing rhythm fast, conducive to production line rhythm control
Automotive hood bracket base adhesion
Recommended product 1: EP 2025 fast-curing epoxy adhesive
EP 2025 Fast-Curing Epoxy Adhesive is a fast-curing epoxy resin adhesive at room temperature. This two-component epoxy adhesive is designed to bond ceramics, metals, glass, plastics, rubber, paper, fabrics and other products. EP Transparent Fast-Curing Epoxy Adhesive can cure without heating. After thoroughly mixing components A and B in 1:1 (weight or volume ratio), the product cures in 5-120 minutes to form protection.
The cured adhesive has the following characteristics:
Resistant to moisture, dirt and other atmospheric components
■ High strength, excellent adhesion
■ Good anti-pollution, low surface pretreatment requirements
■ No solvents, no curing by-products
Stable mechanical and electrical properties at -45-120°C
■ Good adhesion to glass fiber and steel plate
Recommended product 2: EP 2012 rapid curing structural adhesive
EP 2012 Epoxy Adhesive is a room temperature / heat curing resin adhesive. This two-component adhesive is designed for metal bonding, square compartment or SMC glass steel parts bonding, aluminum cellular plate splicing and magnetic steel tile bonding of motor products, ceramic film component sealing, soft magnetic unit sealing, high temperature sensor sealing, etc. EP 2012 Epoxy Adhesive can be cured in both room temperature and heating environments. After thoroughly mixing components A and B at 100:45 (weight ratio), the product cures for a certain time to form protection.
The cured adhesive has the following characteristics:
Resistant to moisture, dirt and other atmospheric components
■ High strength, excellent adhesion
■ Good anti-pollution, low surface pretreatment requirements
■ No solvents, no curing by-products
■ Excellent resistance to high and low temperatures, -50 ℃-180 ℃
■ Resistant to transformer oil, low attenuation
■ Good adhesion to glass fiber and steel plate
Automotive manufacturing is in a critical stage of transformation and upgrading, from fuel vehicles to new energy vehicles, from traditional steel structures to lightweight composites, adhesive technology is also innovating rapidly. Choosing the right structural adhesive products is not only a way to ensure vehicle structural performance, but also an important way to reduce costs and improve efficiency.
EP 2025 / EP 2012 series epoxy structural adhesive, with its excellent mechanical performance and reliable process adaptability, has been widely used in many automotive main factories at home and abroad, leading the new trend of automotive structural adhesion.
Tags: Automotive hood bracket adhesion · Epoxy structural adhesive · Structural adhesive · Lightweight adhesion scheme · Aluminum alloy adhesive
