As is well known, polymer materials are prone to aging and must be protected during use. In order to enhance the resistance of polymer materials to photoaging or delay the process of photoaging, according to the mechanisms of photoaging and thermal aging of polymers, adding light stabilizers before processing and forming polymer materials can obtain higher performance materials.

Light stabilizers are reagents that inhibit and delay the process of polymer photoaging. There are different types of light stabilizers according to their functional characteristics:

UV absorber

Ultraviolet absorbers can absorb ultraviolet radiation energy before polymers. The commonly used UV absorbers currently include salicylates, benzophenones, benzotriazoles, acrylonitrile derivatives, triazine compounds, etc. They can effectively absorb ultraviolet rays with wavelengths ranging from 290 to 410nm. It has good thermal and photostability, compatibility with polymers, and is non-toxic and inexpensive.

Energy transfer agent

Energy transfer agents can transfer the excitation energy of polymers after being excited by ultraviolet light, also known as quenchers.

They are mainly complexes of nickel and diamond, with organic parts such as substituted phenols and thiobisphenol. They can stabilize light by transferring energy through resonance. For example, nickel 3,5-di-tert-butyl-4-hydroxybenzyl phosphate monoethyl ester, nickel n-butyl ammonium 2,2-thiobis (4-tert-octylphenol), nickel dibutyldithiocarbamate, etc.

Light shielding agent

Light shielding agents can reduce the transmission of ultraviolet rays. They either shield or reflect ultraviolet light, preventing it from penetrating into the interior of the polymer, thereby protecting the polymer. For example, some inorganic pigments such as carbon black, zinc oxide, and titanium oxide.

Free radical scavenger

Free radical scavengers can inhibit the generation reaction of free radicals. They are a class of pyridine derivatives, also known as amine compounds, which can capture the active free radicals generated in polymer compounds. Such as 4-benzyl-2,2,6,6-tetramethylpiperidine, sebacic acid (2,2,6,6-tetramethylpiperidine) ester, tris (1,2,2,2,6,6-pentamethylpiperidine) phosphate ester, etc.

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