Why is there a need for adhesive accelerator?
Adhesive accelerator is made from active species that are dispersed in solvents like isopropyl alcohol and acetone. The active species are actually a base that has the capability to initiate a cure on the instant adhesive or cyanoacrylate. The adhesive accelerator is applied on substrates that will be bonded together prior to the application of the adhesive in order to minimize fixture time. Generally, the accelerator is applied on one surface while the adhesive is being applied on the mating surface to prevent the curing of the adhesive through the accelerator before the parts are actually mated. In some instances, the adhesive accelerator can be sprayed over the cyanoacrylate to cure unconfined drops. This technique is widely used in wire tacking on printed circuit board assemblies.
UV curing adhesives for permanent repairs
Aside from cyanoacrylates, there is another alternative to obtain cost effective and permanent repairs on natural and engineered stones. UV curing adhesive works in a similar way to cyanoacrylates in handling repairs because in both instances, the adhesive has to fill the crack or the void; however, in cyanoacrylates, an adhesive accelerator is used to drive the cure while in the UV curing, adhesive, exposure to UV rays will drive the cure. UV curing adhesives are one-component adhesives that stay wet until they are exposed to UV rays. Once exposed to the proper light wavelength, a cure can be instantly achieved. In a manufacturing setting, large high intensity light boxes can be used to cure hundreds of parts that have been applied with UV curing adhesive in a single shift. UV curing adhesives are not as popular as cyanoacrylates in the adhesive market but they are proven technologies used for industrial applications.
Benefits of using cyanoacrylates
Cyanoacrylate adhesive once cured provides unmatched strength to many substrates. A rubber toughened cyanoacrylate provides the best bond strength in metal substrates while ethyl and surface insensitive cyanoacrylate demonstrates better performance when used on polymeric substrates. However, there is one substrate that poses a huge challenge to instant adhesives. When cyanoacrylate is used on glass, the initial bond strength is usually high enough to break the glass but it tends to dramatically drop after a few weeks to create a bond of negligible strength. This is a phenomenon that demonstrates why consumers should evaluate adhesives before making a choice for the application requirements. Assemblies that have been bonded with cyanoacrylates have shown acceptable long term performance even at high temperatures and extreme conditions.