Behavior of UV‐cured print inks on LDPE and PBAT/TPS blend substrates during curing, postcuring, and accelerated degradation

Abstract

During radiation curing, a reactive formulation is converted into a highly crosslinked coating film by means of polymerization reactions. This three‐dimensional (3D) network is resistant to external degrading factors as it cannot be undone by any physical–chemical means. In this study, various ultraviolet (UV)‐curable ink formulations with different pigments were developed. The behavior of the UV‐curable inks was evaluated during UV curing in a photocalorimeter or in a UV tunnel. Inks were exposed to accelerated aging in an accelerated weathering chamber and their physical–chemical properties were investigated. The presence of residual fractions of unreacted species trapped in the 3D network formed during UV curing interferes with the degradation of the main structure during exposure in the weathering chamber. The ink formulations that did not easily absorb UV light increased in gloss and hardness, indicating that residual crosslinking is taking place at the same time that degradation is occurring. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 41116.

Analysis of the Mechanical Properties and Damage Mechanism of Carbon Fiber/Epoxy Composites under UV Aging

“…was weaker than the UV aging effect [25], which is in accordance with the aging law of polymer materials [26][27][28]. The strength decreased by 6%, and the modulus increased by 1% after 80 days of aging.…”

“…The 90 • tensile specimen corresponded to the mechanical properties of the matrix. As shown in Figure 14, the transverse tensile strength/modulus tended to increase at the beginning of aging and then decreased at the later stage of aging as the post-curing effect was weaker than the UV aging effect [25], which is in accordance with the aging law of polymer materials [26][27][28]. The strength decreased by 6%, and the modulus increased by 1% after 80 days of aging.…”

The Aging of Polymers under Electromagnetic Radiation

“…Combining these three materials can help improve the high-content polymer-modified asphalt’s anti-aging properties by absorbing UV radiation, shielding it, and neutralizing free radicals [ 99 ]. In support, Goncalves Bardi et al [ 100 ] assert that polymerization reactions are used in curing blend substrates, which entails converting reactive formulations into highly cross-linked films, resulting in the creation of a 3D network capable of resisting external degradation factors because physical–chemical reactions cannot undo it. Consequently, this anti-aging property is crucial in preventing polar oxygen-containing functional groups from forming, as well as preventing the deterioration of polymer molecules when exposed to extreme weather conditions.…”

“… Modifiers perform better when the base characteristics of polymers have not been altered [ 99 ] Hu et al Performance study on anti-weather aging combinations for high-content polymer modified asphalt and comparison by improved multi-scale mathematical TOPSIS method Experimental research based on TOPSIS calculations Unique combinations of novel materials for light absorption and antioxidation, as well as those for shielding light, can provide a shielding effect against the aging of asphalt polymers. Combining these materials appropriately can equip polymers with anti-aging characteristics [ 100 ] Goncalves Bardi et al Behavior of UV-cured print inks on LDPE and PBAT/TPS blend substrates during curing, postcuring, and accelerated degradation Experimental research method Polymer reactions generate curative blend substrates. Using print inks improves the stability of polymer substrates and polymer composites against UV aging [ 101 ] Wang et al Waterborne polyurethane composite coatings as UV-light converter and directional infrared light barrier for light and heat management in greenhouse Experimental Composite coatings on the greenhouse plastics increased pepper yield by 35%, while each fruit added 8 g in weight.…”

Preparation and properties of light-resistant printing UV ink modified with nano-TiO2 on wood substrate

“…UV inks are cured under a chemical process of polymerisation, which are motivated by free radicals under UV light. Therefore, UV inks are welcomed by printing manufactory and used in many areas such as plastic, paper, furniture, electrotechnics, machinery, and so on [1][2][3][4][5]. However, the growth in exterior applications of UV inks has raised questions about their durability, especially resistance to light aging.…”