With the emergence of new materials and the improvement of molding processing methods, the requirements for heat resistance and long-term durability of UV absorber are getting higher and higher. In addition to some engineering plastics require higher processing temperature, for universaal plastics and modified plastics, the method of increasing the processing temperature is also commonly used in order to improve production efficiency. So this requires UV absorber with good heat resistance and low volatile, in order to ensure the processing technology of plastic products and its application performance. Therefore, the increase of the molecular weight of benzotriazole UV absorber has become a research hot spot at home and abroad.
Ultraviolet absorption spectrum of UV234 in toluene
Omnistab UV234 is a kind of hydroxybenzotriazole UV absorber, which can absorb UV wavelengths in the range of 300-380 nm to achieve the function of protecting polymer compounds. The presence of two cumyl groups in the ortho and para position of the hydroxyl group in its structure greatly improves its thermal stability. Due to its super high heat resistance, it has a excellent effect on polymers that need to be processed at high temperatures, such as polycarbonate, polyester, polyacetal, polyamide, polyphenylene sulfide, and aromatic copolymer , thermoplastic polyurethane, polyvinyl chloride, styrene, etc.
Comparison of thermal stability between UV234 and other UV absorber
Omnistab UV234 has good compatibility with most polymers. Due to its high thermal stability and low volatility, it is especially suitable for plastic processing such as films and fibers. When used in outdoor products, it play a good synergistic stabilizing effect when combined with phenolic antioxidants, phosphite antioxidants and hindered amine light stabilizers (HALS), and not only has a good application prospect in the plastic industry, but also has a good application and development space in coatings, dyes, pesticides, cosmetics and other industries.
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