Acid absorbers/acceptors appear as white powders or pellets that blend discretely into adhesive formulations. Key features include high acid-scavenging capacity, minimal impact on cure chemistry, and long-term protection effects. Acid absorbers prove valuable in acid-sensitive substrates or components, making them essential for electronics potting, automotive assembly, and long-term preservation applications.
Common types include metal oxides, hydrotalcites, specialized zeolites, and reactive acid scavengers. Recent innovations focus on multifunctional absorbers that combine acid neutralization with additional benefits like moisture control or thermal stabilization addressing multiple degradation mechanisms.
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Actmix® MgO-75GE F140 by Ningbo Actmix Rubber Chemicals is a magnesium oxide. Acts as a metallic oxide vulcanization activator, acid-acceptor, and adhesion promoter. Improves processing safety of CR, CSM, CM, CIIR, FPM, etc. and lowering the possibility of rubber compounds scorching by means of heightening the critical temperature of alkaline catalyst. It can lower the critical temperature of acid catalyst. Improves aging properties of halogen compounds especially CR and FPM. Actmix® MgO-75GE F140 can neutralize trace acid in cold vulcanization. It is compatible with NBR, SBR, AR and ECO. Its recommended addition level is 3-5 phr.
RA 150 by Dead Sea Periclase is an active magnesium oxide. Possesses high purity and activity. Used in rubber and adhesives industries. Regulates the rate of vulcanization and prevents the development of "scorch" in the production of polychloroprene rubber. RA 150 acts as an acid acceptor and integral part of the bonding system in polychloroprene-phenol resin adhesives.
Rhenogran® MgO-75 by LANXESS is a curing activator and acid acceptor particularly for polychloroprene rubber (CR) and adhesives. It is a blend of magnesium oxide, polymer binder and dispersing agents. It is easy to incorporate and disperses quick and homogeneously in the mix. The dosage level of the grade is 2-4 phr. The storage stability of Rhenogran® MgO-75 is 365 days.
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