When lubricants are exposed to heat, gas or mechanical stress, molecules break down and form free radicals that react with oxygen causing oil thickening, deposits and acid build-up. Antioxidants extend the life of lubricants by eliminating these free radicals and preventing thermal oxidative decomposition. Due to degradation, lubricants that do not contain antioxidants may need to be replaced at short notice.
Antioxidants are additives designed to extend the life of a lubricant by increasing the oxidation resistance of the base oil. Antioxidants allow lubricants to operate at higher temperatures than they would without them. Many synthetic lubricants, particularly hydrocarbon-based lubricants, are susceptible to degradation by oxygen. This oxidation process, triggered by the formation of reactive free radicals and peroxides, is a major cause of oil thickening and the formation of sludge and varnish in many applications.
Destructive oxidation of oil can be described as a cyclic process involving initiation, propagation, branching and termination. Unless the cycle is interrupted or terminated, oxidation will continue to occur until the oil or grease is no longer available.
There are two types of antioxidants: primary and secondary antioxidants. Primary antioxidants usually consist of aromatic amines and hindered phenols. Secondary antioxidants usually consist of phosphite esters and certain sulphur-containing compounds, such as thioethers and thioesters. Each type of antioxidant performs a different function to inhibit oxidation.
When free radicals are formed, the oxidation process begins with the initiation phase. The primary antioxidants are 'free radical scavengers' that react rapidly with free radicals during the propagation phase, slowing down the degradation process by forming new, more stable free radicals. The secondary antioxidants react with peroxides, which are usually present when the lubricant reacts with oxygen. These antioxidants are responsible for breaking the cycle and preventing branching and further propagation. In most cases, grease formulators will use a combination of primary and secondary antioxidants to provide maximum protection against oxidative degradation of the oil.
Antioxidant 1010
Most commonly, a pressure differential scanning calorimeter (PDSC) is used to measure the efficiency of the antioxidant additive package. This test, based on ASTM Method D-6186, measures the ability of an oil or grease to resist oxidation in very harsh, high-pressure, oxygen-rich environments at high temperatures. It is usually reported in "minutes", the longer it takes for the exothermic reaction to occur, the better the oxidative stability.
Antioxidant 1010 has a chemical name: tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid] pentaerythritol ester. It is a white crystalline powder with stable chemical properties and can be widely used in general plastics. Engineering plastics, synthetic rubber, fiber, hot melt adhesive, resin, oil, ink, paint and other industries.
1. Extend the service life of plastic products
2. Can be used for polypropylene, polyethylene, polyoxymethylene, ABS resin and various synthetic rubber and petroleum products.
3. When this product is used in polypropylene with auxiliary antioxidant DLTP, it can significantly improve its heat resistance
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