Differences Between Light Stabilizers 770 and 622

In the field of chemistry, light stabilizers are important materials used to inhibit and slow the degradation of polymer materials. Light stabilizers 770 and 622 are two commonly used types; they differ to some extent in molecular structure, properties, and application fields. The following introduces these two light stabilizers from several aspects.

First, light stabilizers 770 and 622 differ in molecular structure. Light stabilizer 770 is a polymer containing a heterocyclic structure and aromatic amine groups in its molecule, giving it high chemical and thermal stability. Light stabilizer 622, by contrast, is a terpolymer whose molecule contains heterocyclic, aromatic amine, and ester groups; these structures give it strong antioxidant capacity and UV-absorption ability.

Second, light stabilizers 770 and 622 differ somewhat in their properties. Light stabilizer 770 has good heat resistance and UV resistance, and can effectively prevent yellowing and cracking of polymer materials. At the same time, it also has certain antioxidant and anti-hydrolysis capabilities, making it suitable for polymer materials processed at high temperatures or used in humid environments. Light stabilizer 622, on the other hand, has stronger antioxidant capacity and UV absorption, making it suitable for polymer materials exposed to sunlight, such as outdoor building materials and automotive parts.

In terms of application fields, light stabilizer 770 is mainly used in plastics, rubber, coatings, and adhesives. In plastic products, it effectively prevents yellowing and cracking under UV light; in rubber products, it improves UV and aging resistance; in coatings and adhesives, it improves the coating's UV and aging resistance. Light stabilizer 622 is mainly used in outdoor building materials, automotive parts, textiles, and similar fields—such as automotive topcoats, outdoor plastic products, and tents—where it effectively prevents oxidation and degradation of these products under sunlight.

In summary, light stabilizers 770 and 622 differ to some extent in molecular structure, properties, and application fields. Light stabilizer 770 has better thermal stability and antioxidant capacity, suitable for polymer materials processed at high temperatures or used in humid environments; while light stabilizer 622 has stronger antioxidant capacity and UV absorption, suitable for polymer materials exposed to sunlight. In practical applications, a suitable light stabilizer can be selected according to the material's service environment and requirements to improve the performance and service life of polymer materials.

In the future, as requirements for polymer-material performance continue to rise, the research and development of light stabilizers will become even more important. On one hand, new types of light stabilizers need to be studied to improve their performance and efficiency; on the other hand, targeted light stabilizers must be developed for the application scenarios of different materials. At the same time, with growing environmental awareness, the research and development of low-toxicity, harmless light stabilizers will also become a future trend.

In conclusion, light stabilizers 770 and 622 are two commonly used light stabilizers that differ in chemical properties and application fields. In practical applications, the appropriate light stabilizer should be selected according to the specific situation to improve the performance and service life of polymer materials.