UV absorbers and Light Stabilizers on plastics

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Update time : 2019-07-14 14:26:35

In the process of outdoor use, polymer materials may deteriorate in appearance or mechanical properties such as yellowing, brittleness and cracking due to the action of ultraviolet light, heat, oxygen or metal ions. In order to give full play to the function of the material and extend the service life of the product, it is necessary to add UV absorbers and light stabilizers to improve the weather resistance of the product.

UV absorbers, the role of blocking, absorbing ultraviolet light, significantly reduce the intensity of radiation polymer materials to slow down the aging rate, maintaining the long-term performance and stability of polymer products. The industry is often combined with light stabilizers can have a synergistic effect. The light stabilizer can capture the free radicals in the material, blocking the chain reaction of light and oxygen aging, so that the free radicals can not continue to continue to damage the molecular chain, effective protection of polymers, to avoid yellowing, gloss reduction and physical properties weakening and other issues, strengthen the product.

It can effectively protect the polymer, avoid yellowing, gloss reduction and physical properties, and strengthen the weather resistance of the product. It is often added to plastics, coatings, cosmetics and other products to prevent their light deterioration caused by long-term exposure to light. Simply put, the light stabilizer is to absorb the effects of ultraviolet light, while UV absorbers are directly absorbed by the UV.

In our daily production process, often used in conjunction with the stock, can play a very good synergy, which is often said to reflect plus absorption of the two ways. So in the process of product selection, if the product does not form a formulation system, pay more attention to the premise of the anti-UV effect, you need to focus on the synergistic effect of the product.

UV absorbers according to the chemical structure can be divided into the following categories: salicylates, phenyl ketones, benzotriazoles and so on, different types or different models of UV absorbers have different absorption wavelengths and absorption peaks, and absorption wavelengths and absorption peaks represent the effect of the use of the product, different light stabilizers are divided into bursting agents, free radical capture agents, hydroperoxide decomposers, the type chosen is different, add The amount of different types and additions, the final effect will have a very big difference. Compound UV absorbers can be more in complex situations, to enhance the product anti-aging grade and slow down the aging rate.