light stabilizer & UV Absorber for plastic materials

light stabilizer is a kind of additives that can inhibit or reduced light effect on the degradation of plastic, improve the light fastness of the material of plastic raw materials. And most of them can absorb ultraviolet light, so it is also called UV Absorber. The ultraviolet ray in sunlight is the main reason for the aging effect on polymer materials. Although uv accounts for only about 5% of the sunlight, but the energy is very big, the energy is enough to destroy polymer chemical bonds, make its molecular chain rupture, crosslinking, its mechanical performance enough, at the same time, also change the color of it. 

The mechanism of the light Stabilizer for varies according to its own structure and variety. Some can ultraviolet shielding, reflection or absorb ultraviolet light and the heat energy is transformed into harmless; Some can be quenched by ultraviolet radiation excited state molecules or groups, to make it back to the ground state, the exclusion or slow down the possibility of a light REDOX reaction; Some oxidation reduction due to capture light produce free radicals, thus preventing the lead to products aging free radical reaction, make the products from uv damage. 

Effectively prevent industrial light aging resistance, by two or more different mechanism of antiaging agent distribution, because of various inhibitor especially has its own light absorption agent on the uv absorption of different wavelengths. Compound formula such as: diphenyl ketone + benzotriazole and hindered amine (HAL), can act as a single light Stabilizer is unable to achieve the best results.. 

Join in sunscreen cosmetics uv absorber, the mechanism of sunscreen is also based on scattered or absorbed the incident to the surface of the skin to ultraviolet, thus make the skin to prevent or reduce the damage from ultraviolet rays. 

Light Stabilizer belongs to the permanent stability additives, through shielding and absorbing uv or ultraviolet excitation quenching excited molecular energy, capture free radicals, suppressing light oxidation degradation, extend the service life of products. Current commercially available varieties mainly include two benzophenone, benzotriazole, triazine, such as ultraviolet absorbent, nickel salts excited state quenching agent and hindered amine light Stabilizer and so on. Light Stabilizer used in outdoor products, agricultural plastic greenhouse film is the largest domestic light Stabilizer consumption market. From the point of structure, hindered amine light Stabilizer production consumption of the biggest, represented by 622, 944, convergent hindered amine light Stabilizer have become agricultural films with light Stabilizer pillars of products (table 12 a table 15). It is important to note that with benzotriazole type and diphenyl ketone class represented by the ultraviolet absorbent capacity increase rapidly, and has set up a abroad, export. Show that the light Stabilizer industry product structure tend to reasonable.