(1) The light shielding agent has good protective effect and low price, but it has light-shielding and coloring properties and is only suitable for opaque materials;
(2) UV absorbers have wide applicability, but due to their protective effects, they cannot effectively protect the surface of products and thin products. At the same time, because they are pure organic compounds, they are also volatile, blooming, migrating, and being extracted by solvents. And other shortcomings, which not only affects the durability of its effectiveness, but also causes environmental pollution;
(3) Excited state quencher and hydroperoxide decomposer have high light stability, low volatility, small blooming and migration and resistance to extraction, which can effectively protect the surface of the product and thin products. However, the color is deep, toxic and environmentally polluted, and it will decompose and change color at high temperature, and it has an antagonistic effect against sulfur-containing additives;
(4) The free radical trapping agent has light color, outstanding light stability, and can also effectively protect the surface of products and thin products. However, due to its alkalinity, it has an antagonistic effect with acidic substrates and additives. The acidic environment will affect its performance. At the same time, like ultraviolet absorbers, they are also pure organic compounds, they also have shortcomings such as volatility, blooming, migration, and extraction.
