The effect of two different UV absorbers combined with antioxidants on UV resistance of HDPE

Abstract

In order to improve the aging resistance of HDPE, antioxidants (Irganox1010 and Irgafos168) are combined with UV absorber (UV‐326 or UV‐531). Analyses of ultraviolet–visible (UV–vis) and Fourier transform infrared spectroscopy show that UV‐326 has a better capacity of UV absorbance, but easier to migrate to the HDPE surface due to the bigger difference of solubility parameter with HDPE than UV‐531. The mechanical property indicates a better synergistic effect between UV‐531 and antioxidants. With the single addition of antioxidant, the mechanical property sharply decreased to low level during irradiation for 200 h. With single addition of UV absorber, the elongation at break of the sample can still be maintained at about 700% until irradiation for 600 h. When two different UV absorbers are used in combination with antioxidants, HDPE with UV‐326 maintains high mechanical property when irradiated for 1200 h, while the samples containing UV‐531 still maintain good mechanical property when irradiated for 1600 h.

Recent developments of polymer-based encapsulants and backsheets for stable and high-performance silicon photovoltaic modules: materials nanoarchitectonics and mechanisms

“…4b. 62 Antioxidants are used to neutralize radicals, which were generated by UV rays that were not blocked by UV absorbers. Phenolic antioxidants and hindered amine light stabilizers (HALS) are primary antioxidants that act as radical scavengers.…”

Evaluation of properties and aging resistance of epoxy asphalt composite modified by ultraviolet absorber

“…In previous studies, various accelerated UV light sources were used to simulate the effects of long‐term exposure to sunlight on asphalt or resin materials. These sources include high‐pressure mercury lamps with a central wavelength of 365 nm and fluorescent UV lamps with a central wavelength of 340 nm 7,36,37 . Compared with these two light sources, LED‐UV lamps have low heat, stable radiation energy, uniform irradiation, faster accelerated aging efficiency, low energy consumption, environmental protection, and long service life 38,39 .…”

“…These sources include high-pressure mercury lamps with a central wavelength of 365 nm and fluorescent UV lamps with a central wavelength of 340 nm. 7,36,37 Compared with these two light sources, LED-UV lamps have low heat, stable radiation energy, uniform irradiation, faster accelerated aging efficiency, low energy consumption, environmental protection, and long service life. 38,39 Some studies have adopted LED-UV lamps as the light source for UV aging.…”

“…Jiang et al found that UV‐326 absorber is easier to migrate to the sample surface of high‐density polyethylene, resulting in inferior UV resistance compared to UV‐531 absorber. Additionally, they observed that a combination of UV‐531 absorber and antioxidant exhibited a better synergistic effect 36 . Above studies have shown that UV‐531 absorbers are compatible with asphalt or resin polymers and can effectively improve UV resistance without damaging the original physical properties.…”

“…Additionally, they observed that a combination of UV-531 absorber and antioxidant exhibited a better synergistic effect. 36 Above studies have shown that UV-531 absorbers are compatible with asphalt or resin polymers and can effectively improve UV resistance without damaging the original physical properties. Therefore, using UV-531 absorber as an anti-aging agent for the resin/asphalt composite (EA binder) is reasonable.…”