Automotive Polyurethane Adhesive
When it comes to bonding plastic car parts, automotive polyurethane adhesive is the way to go. This type of glue has a wide range of applications and can handle a variety of conditions, including heat, humidity, and cold.
The adhesive composition can also exhibit high mode I fracture toughness. Moreover, the mode I fracture energy decreases with increasing temperature.
Sealing Joints
Adhesive sealants that can stick to a variety of substrates without primer are ideal in the transport industry. This includes aluminium, glass and lacquered metals. In addition, these types of sealants can be painted over, making them less noticeable. Our polyurethane adhesive, which is available in black, meets these requirements. It can be applied using a regular mastic gun and cures to a tough rubbery finish.
In multi-material vehicles, bonded joints play a critical role in structural performance and energy absorption. Various adhesive types and thicknesses react differently to the loads placed on them, with implications for both the vibration amplitude and static strength of the structure. This means it’s important to match the demanding mechanical requirements of a vehicle with realistic manufacturing considerations, such as cost and time constraints.
The mechanical properties of epoxy and polyurethane adhesives were evaluated using experimental tests on single lap joints with different automotive polyurethane adhesive bond gaps and adhesive thicknesses. The results showed that the modal frequencies of the joints decreased with increasing adhesive thickness. For epoxy, this was caused by a decrease in the joint stiffness and a change of the modal shape from torsional to lateral.
The modal frequencies of the joints bonded with polyurethane also dropped with increasing adhesive thickness, but this was due to an increase in the torsional stiffness of the joint. In fact, as the adhesive thickened, it could absorb more torsional vibrations, which improved the structural performance of the vehicle.
Sealing Substrate
One-component moisture cured automotive polyurethane adhesives can be applied to various substrates and adheres to a variety of like and dissimilar surfaces. They cure once exposed to atmospheric moisture and offer an excellent tamper-evidence and sealant performance. They are suitable for seam sealing and simple bonding in the automobile, marine, locomotives and optical & glass applications.
Moreover, these adhesives have good adhesion to metals, steels, plastics and rubbers. They also have high tensile strength and good elasticity. This allows them to withstand heavy loads in the transportation industry and resist stresses from thermal and mechanical changes.
These adhesives are also capable of bonding dissimilar substrates. They can be used in a wide range of temperatures, from -40°F/-40°C to 194°F/90°C. They can also be used as an alternative to rivets and other mechanical fasteners, especially in situations where the joints are exposed to vibration or movement.
Besides, these adhesives have low odor and have good thixotropy, meaning that they do not flow easily, making them easy to use for manual application. In addition, they are non-flammable and have good resistance to corrosion. Furthermore, they are compatible with REACH (Registration of chemicals) regulations, which reduces user exposure to harmful chemicals.
Adhesive Sealants for the Transport Industry
The road transport industry requires adhesives and sealants that can be used on a variety of substrates, in different temperatures and in harsh conditions. They can also be used in different ways, from bonding components together to sealing joints and surfaces. They can even replace rivets, making them a more durable alternative for many applications.
Adhesive and sealant systems are increasingly being used in the automotive sector, especially for the bonding of metal and plastics and for the assembly of a wide range of parts and accessories. The growth in their use is being driven by the need to comply with stringent fuel efficiency requirements, which necessitate using lightweight materials such as aluminums and composites.
Specifically, they are being used for the assembly of vehicles such as buses, fire trucks and bulldozers. These types of transportation vehicles must withstand a variety of weather conditions, including rain, snow and ice. This is why they are often assembled with the help of a polyurethane adhesive that provides a watertight seal.
These products typically have low to moderate viscosity, and they can be dispensed using either manual or pneumatic applicators. The adhesives and sealants also have a long shelf life, and they can be stored in a variety of temperature conditions. In addition, they have automotive polyurethane adhesive a high tensile strength and good elongation. They are suitable for bonding a variety of dissimilar substrates such as glass, metals, ceramics and rubber.
Polyurethane-Based Adhesive Sealants
A polyurethane adhesive is a versatile sealing product, suitable for bonding different substrates such as aluminium, glass and lacquered metals. It can also be used to seal welds in vehicles. These adhesives offer high bond strength, durability and flexibility. They can withstand harsh environmental conditions, such as heat, cold and humidity. They can even be cured in the presence of detergents and chemicals. This makes them the adhesive of choice for transport industry applications.
Light rail vehicle structures adopt a multi-material design strategy to increase energy efficiency and improve safety. Bonding between dissimilar materials is a key part of this design, and it is largely impossible to achieve load transfer without adhesives. The selection of an appropriate adhesive is therefore critical in ensuring that the structural performance and vibrational behaviour are optimised.
The current state-of-the-art light rail vehicles use a large amount of adhesive bonding to connect the various components of the body structure. To achieve the highest level of structural integrity, these bonded joints need to be both stiff and strong, and must be able to withstand dynamic loads.
This research investigates the effect of adhesive thickness on the mechanical properties of a multi-material light rail vehicle structure, by using FEM to study the dynamic behaviour of the bonded assembly. The results showed that the modal frequencies and shapes of the structure with epoxy and polyurethane adhesives differed significantly. The modal shapes of the structure with the polyurethane adhesive were more flexible, which is a desirable attribute for the vibrational behaviour of a vehicle.