Ingredients and services for the formulation
of lubricants and industrial fluids
Lumar range of antioxidants is extremely broad. Antioxidants are
specialty chemicals which interrupt the degradation process of base fluids
in different ways, according to their structure. The major classifications
of antioxidants are listed below:
Primary Antioxidants, react rapidly with peroxy radicals
(ROO*). They are also called free radical scavenging antioxidants because
they inhibit oxidation via chain terminating reactions. They have reactive
OH or NH groups. (Hindered phenols and Secondary aromatic amines). Inhibition
occurs via a transfer of a proton to the free radical species. The resulting
radical is stable and does not abstract a proton from the polymer chain.
Secondary Antioxidants, reacting with hydroperoxides (ROOH) are frequently
called hydroperoxide decomposers because they decompose hydroperoxides into
non-radical, non-reactive, and thermally stable products.
They are often used in combination with primary antioxidants to
yield synergistic stabilization effects.
Hydroperoxide decomposers prevent the split of hydroperoxides into
extremely reactive alkoxy and hydroxy radicals. Lumar is offering
organophosphorus compounds and thiosynergists which have proved
their efficiency in the formulation of the most demanding applications.
Multi-functional Antioxidants, are combining both primary
and secondary antioxidant functions in one compound.
Radical scavengers are antioxidants capable of trapping
alkyl radicals. Scavenging of alkyl radicals would immediately inhibit
the autoxidation cycle. Under oxygen deficient conditions alkyl radical
scavengers contribute significantly to the stabilization of polymers.
Most popular antioxidants offered by Lumar are listed below: