Studying the Effect of Initiator Type and Concentration on the Setting Time of Acrylic Ester Anaerobic Adhesives

作者：Vahaj B; Naimi Jamal M R^*; Hassanshahi M; Atai M

来源：The Journal of Adhesion, 2016, 92(6): 459-468.

DOI：10.1080/00218464.2015.1043526

• Anaerobic adhesives
• Initiator types
• Metals
• Polymers
• Setting time

Anaerobic adhesives are polymerized and hardened rapidly through a free radical mechanism when placed between two metallic surfaces. The conducted investigations from 1960 have studied polymerization rate in the presence of different metallic ions, their breakdown speed using polarography techniques, and also the common use of cumene hydro-peroxide as an initiator. In order to investigate the effect of initiator type and concentration on the setting time of these adhesives, four different types of initiators in concentrations of 1-3 parts per hundred resin (phr) were incorporated into the monomer. The initiators were cumene hydroperoxide (CHP), methyl ethyl ketone peroxide, tert-butyl hydroperoxide, and benzoyl peroxide. The metal salt used was copper (II) saccharin. The obtained results indicated that the setting time in the methacrylate compositions depends not only on the initiator concentration, but also on its relative amount with respect to the metal ion, and some other factors such as monomer type, and stoichiometric relation between the metal ion and the accelerator-here, dimethyl p-toluidine, which was assumed to have an important role in the setting process. Finally, CHP was identified as the most appropriate initiator with an optimum value of 2 phr.

• 出版日期2016