Permabond’s adhesive chemists are always striving to develop solutions to bonding challenges in rapidly changing and evolving manufacturing industries. As new materials, technologies and processes are introduced to production lines, the demands on the adhesives used to join components may also change. Permabond’s most recent response to market demands include an innovative nylon bonder, a new hydrogen-ready sealant, a new thermally conductive, lightweight foam adhesive for e-vehicle batteries and a metal repair epoxy.
New Nylon Bonder
Nylon is a popular, low cost and widely used material. However, it is difficult to bond as it doesn’t respond well to surface treatment processes, and migration of slip additives gives the surface constant lubricity meaning that often, an initially good bond will fail within a few days.
Permabond’s chemists have responded with the development of TA4660, a new breakthrough structural acrylic adhesive, capable of forming strong and durable bonds to filled and unfilled nylon without the need for costly and time-consuming surface pre-treatment. In pull tests, the bond is so strong that it results in substrate failure, meaning that the nylon failed rather than the adhesive bond.
TA4660 can be used for bonding nylon to itself or to metal surfaces such as steel or aluminium. It has good thermal and chemical resistance and its toughened matrix helps absorb differential thermal expansion and contraction stresses and offers good vibration and impact resistance. It is ideal for use in automotive parts assembly, for bonding and sealing nylon housings (such as battery casings). It is suitable for a wide variety of applications including bonding sports equipment, electronics, sensors, profiles and composite parts.
New hydrogen-ready, toughened, anaerobic sealant
In a bid to counteract global gas shortages and reduce gas costs for customers, the gas industry has been exploring the option of mixing hydrogen with natural gas for domestic supplies. With this comes certain challenges as hydrogen molecules are much smaller, more searching and more explosive than natural gas molecules. It is therefore essential that gas connections and pipe joints are sealed securely, with a sealant approved for use with hydrogen.
Permabond has responded with the launch of F201HV anaerobic sealant, which meets the requirements of Inorm KE214 and has been approved for use with hydrogen by official gas testing organisation KIWA.
Unlike conventional anaerobic thread sealants, F201HV isn’t brittle. Its core-shell toughening enables the cured material to flex, allowing differential thermal expansion and contraction, and enabling the sealing dissimilar metals, such as brass and copper. This high strength, high performance toughened anaerobic can be used to seal threaded metal pipe joints, or concentric metal parts that slot together, reducing the risk of loosening, accidental damage or tampering, all of which could result in hydrogen leakage.
New lightweight, thermally conductive adhesive filler
Permabond has been working closely with battery manufacturers to develop its new patent-pending, lightweight, thermally conductive adhesive for e-vehicle batteries. When mixed, the two- part system forms a foam structure that expands to fill the battery pack’s free space. As it expands in a closed container, the compression creates a highly conductive skin that efficiently transfers heat to the cooling plate. The dual structure of the light-weight foam and hard skin in contact with the battery cells, housing, and heat sink, creates a thermal bridge to conduct and dissipate heat. The low-density foam weighs 0.7g/cm³ and offers a thermal conductivity of 0.8 W/m.K. The skin is highly conductive at 2.6 W/m.K. and is the main route for transferring heat away from components.
An additional benefit of this product is that the foam is a lot easier to dismantle than a solid-filled system, reducing recycling costs and improving recycling processes. The foaming nature of the adhesive also makes it more economical, as less liquid adhesive is required to fill the space.
The patent-pending technology can be tailored to meet individual manufacturers’ needs. Flow requirements, cure speed, fire retardancy and electrical insulation are all characteristics that can be adjusted or introduced if the application requires it.
Permabond’s New ET5003 Metal Repair Epoxy
Permabond ET5003 has been developed as a high strength, structural adhesive and filler for metal repair applications. The rapid curing adhesive gives a metallic appearance and can be sanded or machined when cured. Shear strength on steel is 20-30 MPa and the product has excellent resistance to impact and vibration stresses, as well as to harsh environmental conditions.
This metal repair compound can be used for repairing or rebuilding spun bearings, damaged shafts, repairing keyways, splines, broken gears or for general bonding of metal parts where a good, high strength, metallic-looking adhesive is required. Depending on the joint configuration, ET5003 could also be suitable for repairing or replacing welding or brazing.
