Description

Other Name:

Advastab 802;

Arbestab DSTDP;

Cyanox STDP;

Naugard DSTDP;

Plastanox STDP;

Hostanox SE 2;

Irganox PS 802;

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When we come into contact with plastics or other polymers, we often hear about antioxidants. Perhaps also probably understand that the addition of antioxidants is to antioxidant, anti-aging, but may be a large majority of friends still do not understand the mechanism. Today, we will learn to learn the causes of aging of polymer materials, the mechanism and its solution.

What is oxidation?
Professional explanation: oxidation (oxidation), narrowly defined as the chemical reaction between oxygen and other material elements, is also an important chemical unit process. Broadly speaking, oxidation refers to the process in which a substance loses electrons (the oxidation number rises).
Common explanation: yellowing, aging, hardening, brittleness, softening, dullness, rusting and other phenomena caused by wind, sun and rain, oxygen in the air, hydrodynamic and wind erosion can be roughly categorised as oxidation.

The best example is the phenomenon of a cut apple, exposed to the air for some time, gradually turning yellow. In fact, not only apples will oxidise, our skin will also oxidise, plastic products and polymers will oxidise and age! Aging is a common process in nature, the most common around us is life from birth, growth, aging process, is the most typical of an aging process.

Corrosion of metal materials is also a kind of aging, from shiny objects into rust, until the loss of value.
The same goes for polymers. During processing and use, due to the combined effects of heat, oxygen, water, light, microorganisms, chemical media and other environmental factors, the chemical composition and structure of polymers undergo a series of changes, and their physical properties deteriorate accordingly, such as hardening, sticking, brittleness, discolouration, loss of strength, and so on, which are known as aging.

Molecular polymer aging, what will produce bad?
1, reduce mechanical properties
2, discolouration
3, reduce transparency
4, yellowing, aging
5, cracking
6, odour (alcohols, aldehydes, ketones)
—–
Polymer aging, what factors are at fault?
1, the structure of the polymer: double bond, benzene ring is not stable enough structure, easily lead to polymer decomposition, yellowing
2, polymer synthesis of residual impurities: peroxide, metal ions lead to polymer degradation, yellowing
3、Oxygen (air): the presence of oxygen, ozone caused by the decomposition of polymer
4, energy: mechanical stress, heat, ultraviolet light
5、Air pollution: NOx, SOx.
6, water, moisture: may lead to dissolution, precipitation of biological: degradation caused by biological enzymes

Why do polymers age?
Polymers form excited state molecules in the presence of heat or light. When the energy is high enough, the molecular chains break to form free radicals, which can form chain reactions within the polymer that continue to initiate degradation and may also cause cross-linking. The Culprit: Free Radicals R-

If oxygen or ozone is present in the environment, a series of oxidation reactions are also induced, resulting in the formation of hydroperoxides (ROOH), which further decompose into carbonyl groups.
If residual catalyst metal ions are present in the polymer, or if metal ions such as copper, iron, manganese, cobalt, etc., are brought in during processing or use, the oxidative degradation reaction of the polymer will be accelerated. Polymers protect against ageing.

Therefore, antioxidants have become a life-saving elixir for the materials industry!
To prevent polymer aging, you can isolate light and heat, and most importantly, add antioxidants! So here’s the point! Where to find efficient, genuine, good quality antioxidants?