Mechanism of Light Stabilizers

Tiangang Auxiliary is a company specializing in the production and sales of additives, one of whose main products is light stabilizers. Light stabilizers are widely used in plastic products; they can effectively prevent the effects of light, oxidation, heat, and other chemical reactions, thereby improving the service life and performance of plastic products. This article will detail the mechanism of light stabilizers and their application in plastic products.

Mechanism of Light Stabilizers

A light stabilizer is an additive that resists light and thermal aging. Its main function is to absorb and disperse harmful ultraviolet and other light within the polymer, thereby preventing the aging and deterioration of plastic products. Light stabilizers can be divided into absorptive and reactive types, of which the absorptive type is the most commonly used.

Absorptive light stabilizers mainly protect the polymer by absorbing ultraviolet light, so that the polymer is not affected by UV and does not age or deteriorate. When light strikes the surface of a plastic product, the absorptive stabilizer absorbs the light and converts it into heat energy, preventing the light from penetrating and damaging the polymer's molecular structure. Absorptive light stabilizers come in many types—such as phenolic, benzophenone, benzimidazole, and tricarboxytriazole classes—and different types are suitable for different kinds of plastic products.

Reactive light stabilizers, by contrast, react with free radicals in the polymer to form stable structures, thereby preventing the polymer from being oxidized and cracked. Reactive light stabilizers include phosphate, thiol, and hydroxybenzoate classes; different reactive stabilizers are suited to different types of plastic products and application conditions.

Application of Light Stabilizers in Plastic Products

Plastic products are often used outdoors and in high-temperature environments, such as automotive interiors, building materials, and electronic equipment housings. These materials need strong anti-aging and anti-deterioration properties, which light stabilizers can help achieve. When selecting a light stabilizer, factors such as the type of plastic used, the product's application environment, and its expected service life must be considered.

The choice of light stabilizer also varies with the type of plastic. For example, using a benzimidazole (BMI) light stabilizer in polycarbonate (PC) can effectively prevent photo-aging, while using a triphenylacetonitrile (Tinuvin 292) light stabilizer in unsaturated polyester (UPE) can improve its heat resistance and oxidation resistance. In addition, plastic products that must be exposed to outdoor environments for long periods require light stabilizers with high stability, low volatility, and good gas-phase stability.

In summary, the application of light stabilizers in plastic products is very important. By selecting appropriate light stabilizers and using them correctly, the anti-aging performance of plastic products can be improved and their service life extended. As a professional additive supplier, Tiangang Auxiliary will continue to develop and produce higher-quality light stabilizers to meet market demand and provide better products and services to our customers.