10 сентября, 2015 
Malyar A. Aerobic Acrylic Curing Technology-Activator and Heat Cures
Chemical or heat curing structural strength aerobic adhesives technology was first introduced to the assembly industry in the early 1980s [1,2]. High-performance characteristics derived from combining urethane oligomers with (meth)acrylic monomers and “elastomeric domain’’ compounds. The meaning of the term ‘‘aerobic’’ and how it is different from anaerobic adhesives and 2nd-generation acrylic adhesives are explained in these and other articles [1-4].
Aerobic adhesives are composed of proprietary catalysts, elastomeric domain fillers, and low-vapor-pressure monomers. Formulations derived from this technology do not exhibit the severe sensitivity toward air inhibition shown by other acrylic adhesives. The result is that aerobic adhesives are usable on more porous surfaces and in wider gaps than was previously considered practical.
Of course, all vinyl polymerizations can be inhibited by air, hence the commonly seen ‘‘tacky’’ feel of many UV cured products. Therefore, those physical properties that are recognized as being affected by air inhibition mechanisms are compared in Appendix A.
One of the tests is maintaining strength through a gap. This can be affected by air inhibition, as well as by the diffusion of accelerators. In another test, air was beaten into several adhesive formulations. The aerobic adhesives were only marginally affected by air inclusion when cured between surfaces. Like anaerobics, fillets or adhesive squeezed outside of a bonded joint will remain uncured unless exposed to UV light.
In the last test, a porous material, pine wood, was chosen as a substrate because it assures that air is to remain in intimate contact with the curing adhesive. The ability to lock the threads of an iron nut and bolt without use of an activator is a recognized test for determining whether a formulation is capable of anaerobic cure.
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