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Light agents are also called ultraviolet agents, which are chemical additives used for photo-oxidation degradation of polymer resins and weather resistance of plastic products. According to different mechanisms, light agents can be divided into light shielding agents, ultraviolet absorbers, excited state quenchers, and base trapping agents. Most light shielding agents are carbon black, zinc oxide, and some inorganic pigments or fillers, and their function is achieved by shielding ultraviolet rays. The ultraviolet absorber has a strong absorption effect on ultraviolet rays, and through intramolecular energy transfer, the harmful light energy is converted into harmless heat energy to be released, so as to prevent the polymer resin from absorbing ultraviolet energy and induce photo-oxidation reaction. There are many types of compounds involved in UV absorbers, mainly including dibenzoyl compounds, benzoic compounds, salicylate compounds, substituted compounds and analogous compounds. Excited state quenchers are intended to quench the energy on the excited polymer molecules, return them to the ground state, and prevent further polymer chain scission. Excited state quenchers are mostly nickel complexes. The group trapping agent uses hindered amine as the functional group, and its corresponding nitroxyl group is the basis for capturing polymer groups. And because this nitroxyl group is regenerative in the chemical process, the light effect is very prominent. So far, it has developed into many varieties, The type of light agent with large production consumption. Of course, the role of hindered amine light agents is not limited to the capture group. Studies have shown that hindered amine light agents often have the functions of decomposing hydroperoxides and quenching singlet oxygen at the same time.
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CPE will be released when heated or when vulcanizing non-peroxide vulcanization systems. Therefore, an acid-absorbing agent should be used in the formulation, such as calcium stearate, barium stearate, tribasic lead sulfate or magnesium oxide.
